diff --git a/src/Symfony/Component/CssSelector/Node/AbstractNode.php b/src/Symfony/Component/CssSelector/Node/AbstractNode.php
index b1c8e9508d..7477e9119d 100644
--- a/src/Symfony/Component/CssSelector/Node/AbstractNode.php
+++ b/src/Symfony/Component/CssSelector/Node/AbstractNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 abstract class AbstractNode implements NodeInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Node/AttributeNode.php b/src/Symfony/Component/CssSelector/Node/AttributeNode.php
index b10a4dd5b3..af872b79e9 100644
--- a/src/Symfony/Component/CssSelector/Node/AttributeNode.php
+++ b/src/Symfony/Component/CssSelector/Node/AttributeNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class AttributeNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/ClassNode.php b/src/Symfony/Component/CssSelector/Node/ClassNode.php
index 544342f871..f965e7773e 100644
--- a/src/Symfony/Component/CssSelector/Node/ClassNode.php
+++ b/src/Symfony/Component/CssSelector/Node/ClassNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class ClassNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/CombinedSelectorNode.php b/src/Symfony/Component/CssSelector/Node/CombinedSelectorNode.php
index 6d00db431c..39f6599777 100644
--- a/src/Symfony/Component/CssSelector/Node/CombinedSelectorNode.php
+++ b/src/Symfony/Component/CssSelector/Node/CombinedSelectorNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class CombinedSelectorNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/ElementNode.php b/src/Symfony/Component/CssSelector/Node/ElementNode.php
index 71ef121741..06e343e969 100644
--- a/src/Symfony/Component/CssSelector/Node/ElementNode.php
+++ b/src/Symfony/Component/CssSelector/Node/ElementNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class ElementNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/FunctionNode.php b/src/Symfony/Component/CssSelector/Node/FunctionNode.php
index f94af8dafc..612f348c5e 100644
--- a/src/Symfony/Component/CssSelector/Node/FunctionNode.php
+++ b/src/Symfony/Component/CssSelector/Node/FunctionNode.php
@@ -20,6 +20,8 @@ use Symfony\Component\CssSelector\Parser\Token;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class FunctionNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/HashNode.php b/src/Symfony/Component/CssSelector/Node/HashNode.php
index ddbe76477a..20db465162 100644
--- a/src/Symfony/Component/CssSelector/Node/HashNode.php
+++ b/src/Symfony/Component/CssSelector/Node/HashNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class HashNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/NegationNode.php b/src/Symfony/Component/CssSelector/Node/NegationNode.php
index 0fafb0a120..4b5aa2260d 100644
--- a/src/Symfony/Component/CssSelector/Node/NegationNode.php
+++ b/src/Symfony/Component/CssSelector/Node/NegationNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class NegationNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/NodeInterface.php b/src/Symfony/Component/CssSelector/Node/NodeInterface.php
index dd300e23cd..d919e20c71 100644
--- a/src/Symfony/Component/CssSelector/Node/NodeInterface.php
+++ b/src/Symfony/Component/CssSelector/Node/NodeInterface.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 interface NodeInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Node/PseudoNode.php b/src/Symfony/Component/CssSelector/Node/PseudoNode.php
index 0e413adc54..c23ddd5912 100644
--- a/src/Symfony/Component/CssSelector/Node/PseudoNode.php
+++ b/src/Symfony/Component/CssSelector/Node/PseudoNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class PseudoNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/SelectorNode.php b/src/Symfony/Component/CssSelector/Node/SelectorNode.php
index 4958da55af..729e0911b3 100644
--- a/src/Symfony/Component/CssSelector/Node/SelectorNode.php
+++ b/src/Symfony/Component/CssSelector/Node/SelectorNode.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Node;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class SelectorNode extends AbstractNode
 {
diff --git a/src/Symfony/Component/CssSelector/Node/Specificity.php b/src/Symfony/Component/CssSelector/Node/Specificity.php
index 0ce0c3f304..a24b4fdf84 100644
--- a/src/Symfony/Component/CssSelector/Node/Specificity.php
+++ b/src/Symfony/Component/CssSelector/Node/Specificity.php
@@ -20,6 +20,8 @@ namespace Symfony\Component\CssSelector\Node;
  * @see http://www.w3.org/TR/selectors/#specificity
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class Specificity
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/CommentHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/CommentHandler.php
index f480776d2c..a29775cab3 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/CommentHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/CommentHandler.php
@@ -21,6 +21,8 @@ use Symfony\Component\CssSelector\Parser\TokenStream;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class CommentHandler implements HandlerInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/HandlerInterface.php b/src/Symfony/Component/CssSelector/Parser/Handler/HandlerInterface.php
index 049ddd3ec4..a1297c80c0 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/HandlerInterface.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/HandlerInterface.php
@@ -21,6 +21,8 @@ use Symfony\Component\CssSelector\Parser\TokenStream;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 interface HandlerInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php
index b144223fbd..f74bda5126 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/HashHandler.php
@@ -24,6 +24,8 @@ use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class HashHandler implements HandlerInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php
index 86739eab99..358c7c14ad 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/IdentifierHandler.php
@@ -24,6 +24,8 @@ use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class IdentifierHandler implements HandlerInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php
index 97a9387b18..4ea5c484b2 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/NumberHandler.php
@@ -23,6 +23,8 @@ use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class NumberHandler implements HandlerInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php
index 9f7a5946b0..4205296016 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/StringHandler.php
@@ -26,6 +26,8 @@ use Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class StringHandler implements HandlerInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php b/src/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php
index 234bbd84cf..4c2d3354fb 100644
--- a/src/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php
+++ b/src/Symfony/Component/CssSelector/Parser/Handler/WhitespaceHandler.php
@@ -22,6 +22,8 @@ use Symfony\Component\CssSelector\Parser\TokenStream;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class WhitespaceHandler implements HandlerInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Parser.php b/src/Symfony/Component/CssSelector/Parser/Parser.php
index 9625e3e8a1..f94aea36a6 100644
--- a/src/Symfony/Component/CssSelector/Parser/Parser.php
+++ b/src/Symfony/Component/CssSelector/Parser/Parser.php
@@ -22,6 +22,8 @@ use Symfony\Component\CssSelector\Parser\Tokenizer\Tokenizer;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class Parser implements ParserInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/ParserInterface.php b/src/Symfony/Component/CssSelector/Parser/ParserInterface.php
index 3b43a52fde..c5af20367d 100644
--- a/src/Symfony/Component/CssSelector/Parser/ParserInterface.php
+++ b/src/Symfony/Component/CssSelector/Parser/ParserInterface.php
@@ -20,6 +20,8 @@ use Symfony\Component\CssSelector\Node\SelectorNode;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 interface ParserInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Reader.php b/src/Symfony/Component/CssSelector/Parser/Reader.php
index ba2a7f0da9..41136367d8 100644
--- a/src/Symfony/Component/CssSelector/Parser/Reader.php
+++ b/src/Symfony/Component/CssSelector/Parser/Reader.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Parser;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class Reader
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Shortcut/ClassParser.php b/src/Symfony/Component/CssSelector/Parser/Shortcut/ClassParser.php
index 83f8d13d9c..c513de5ff1 100644
--- a/src/Symfony/Component/CssSelector/Parser/Shortcut/ClassParser.php
+++ b/src/Symfony/Component/CssSelector/Parser/Shortcut/ClassParser.php
@@ -23,6 +23,8 @@ use Symfony\Component\CssSelector\Parser\ParserInterface;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class ClassParser implements ParserInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Shortcut/ElementParser.php b/src/Symfony/Component/CssSelector/Parser/Shortcut/ElementParser.php
index 00e443553b..c29f5e442e 100644
--- a/src/Symfony/Component/CssSelector/Parser/Shortcut/ElementParser.php
+++ b/src/Symfony/Component/CssSelector/Parser/Shortcut/ElementParser.php
@@ -22,6 +22,8 @@ use Symfony\Component\CssSelector\Parser\ParserInterface;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class ElementParser implements ParserInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Shortcut/EmptyStringParser.php b/src/Symfony/Component/CssSelector/Parser/Shortcut/EmptyStringParser.php
index 98a08fde06..016cf0a848 100644
--- a/src/Symfony/Component/CssSelector/Parser/Shortcut/EmptyStringParser.php
+++ b/src/Symfony/Component/CssSelector/Parser/Shortcut/EmptyStringParser.php
@@ -26,6 +26,8 @@ use Symfony\Component\CssSelector\Parser\ParserInterface;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class EmptyStringParser implements ParserInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Shortcut/HashParser.php b/src/Symfony/Component/CssSelector/Parser/Shortcut/HashParser.php
index 3dbad79d5b..3f3883bb8d 100644
--- a/src/Symfony/Component/CssSelector/Parser/Shortcut/HashParser.php
+++ b/src/Symfony/Component/CssSelector/Parser/Shortcut/HashParser.php
@@ -23,6 +23,8 @@ use Symfony\Component\CssSelector\Parser\ParserInterface;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class HashParser implements ParserInterface
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Token.php b/src/Symfony/Component/CssSelector/Parser/Token.php
index 6f7586f612..68fac59b03 100644
--- a/src/Symfony/Component/CssSelector/Parser/Token.php
+++ b/src/Symfony/Component/CssSelector/Parser/Token.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Parser;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class Token
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/TokenStream.php b/src/Symfony/Component/CssSelector/Parser/TokenStream.php
index c0525d7a83..1ec727febf 100644
--- a/src/Symfony/Component/CssSelector/Parser/TokenStream.php
+++ b/src/Symfony/Component/CssSelector/Parser/TokenStream.php
@@ -21,6 +21,8 @@ use Symfony\Component\CssSelector\Exception\SyntaxErrorException;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class TokenStream
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Tokenizer/Tokenizer.php b/src/Symfony/Component/CssSelector/Parser/Tokenizer/Tokenizer.php
index 79fa7b77d0..aa9fc50773 100644
--- a/src/Symfony/Component/CssSelector/Parser/Tokenizer/Tokenizer.php
+++ b/src/Symfony/Component/CssSelector/Parser/Tokenizer/Tokenizer.php
@@ -23,6 +23,8 @@ use Symfony\Component\CssSelector\Parser\TokenStream;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class Tokenizer
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php b/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php
index bf5096be9f..af4c31e5b0 100644
--- a/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php
+++ b/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Parser\Tokenizer;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class TokenizerEscaping
 {
diff --git a/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerPatterns.php b/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerPatterns.php
index 326f020821..5b071cd090 100644
--- a/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerPatterns.php
+++ b/src/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerPatterns.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\Parser\Tokenizer;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class TokenizerPatterns
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/AbstractExtension.php b/src/Symfony/Component/CssSelector/XPath/Extension/AbstractExtension.php
index c70609c695..026ac06c79 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/AbstractExtension.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/AbstractExtension.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\XPath\Extension;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 abstract class AbstractExtension implements ExtensionInterface
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php b/src/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php
index cbe48c57a9..6ace8b5925 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/AttributeMatchingExtension.php
@@ -21,6 +21,8 @@ use Symfony\Component\CssSelector\XPath\XPathExpr;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class AttributeMatchingExtension extends AbstractExtension
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/CombinationExtension.php b/src/Symfony/Component/CssSelector/XPath/Extension/CombinationExtension.php
index 9ce018f13a..0d2d658b65 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/CombinationExtension.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/CombinationExtension.php
@@ -20,6 +20,8 @@ use Symfony\Component\CssSelector\XPath\XPathExpr;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class CombinationExtension extends AbstractExtension
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/ExtensionInterface.php b/src/Symfony/Component/CssSelector/XPath/Extension/ExtensionInterface.php
index 9b47f24f36..3607022891 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/ExtensionInterface.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/ExtensionInterface.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\XPath\Extension;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 interface ExtensionInterface
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/FunctionExtension.php b/src/Symfony/Component/CssSelector/XPath/Extension/FunctionExtension.php
index 41ece8a422..ea05523055 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/FunctionExtension.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/FunctionExtension.php
@@ -25,6 +25,8 @@ use Symfony\Component\CssSelector\XPath\XPathExpr;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class FunctionExtension extends AbstractExtension
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/HtmlExtension.php b/src/Symfony/Component/CssSelector/XPath/Extension/HtmlExtension.php
index 0da74d4727..de6ce41621 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/HtmlExtension.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/HtmlExtension.php
@@ -23,6 +23,8 @@ use Symfony\Component\CssSelector\XPath\XPathExpr;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class HtmlExtension extends AbstractExtension
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/NodeExtension.php b/src/Symfony/Component/CssSelector/XPath/Extension/NodeExtension.php
index 2b8920f1ab..9d7f8fa3f0 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/NodeExtension.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/NodeExtension.php
@@ -22,6 +22,8 @@ use Symfony\Component\CssSelector\XPath\XPathExpr;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class NodeExtension extends AbstractExtension
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Extension/PseudoClassExtension.php b/src/Symfony/Component/CssSelector/XPath/Extension/PseudoClassExtension.php
index 008ec2b4b1..1c8b217e39 100644
--- a/src/Symfony/Component/CssSelector/XPath/Extension/PseudoClassExtension.php
+++ b/src/Symfony/Component/CssSelector/XPath/Extension/PseudoClassExtension.php
@@ -21,6 +21,8 @@ use Symfony\Component\CssSelector\XPath\XPathExpr;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class PseudoClassExtension extends AbstractExtension
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/Translator.php b/src/Symfony/Component/CssSelector/XPath/Translator.php
index 5053793ea0..8c021b3bee 100644
--- a/src/Symfony/Component/CssSelector/XPath/Translator.php
+++ b/src/Symfony/Component/CssSelector/XPath/Translator.php
@@ -25,6 +25,8 @@ use Symfony\Component\CssSelector\Parser\ParserInterface;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class Translator implements TranslatorInterface
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/TranslatorInterface.php b/src/Symfony/Component/CssSelector/XPath/TranslatorInterface.php
index bc19ae8634..0b5de83d57 100644
--- a/src/Symfony/Component/CssSelector/XPath/TranslatorInterface.php
+++ b/src/Symfony/Component/CssSelector/XPath/TranslatorInterface.php
@@ -20,6 +20,8 @@ use Symfony\Component\CssSelector\Node\SelectorNode;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 interface TranslatorInterface
 {
diff --git a/src/Symfony/Component/CssSelector/XPath/XPathExpr.php b/src/Symfony/Component/CssSelector/XPath/XPathExpr.php
index c7ef97cb9a..420ef3d85c 100644
--- a/src/Symfony/Component/CssSelector/XPath/XPathExpr.php
+++ b/src/Symfony/Component/CssSelector/XPath/XPathExpr.php
@@ -18,6 +18,8 @@ namespace Symfony\Component\CssSelector\XPath;
  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
  *
  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
  */
 class XPathExpr
 {