diff --git a/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php b/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php
index daaa928fa3..8722d8751c 100644
--- a/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php
+++ b/src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php
@@ -432,9 +432,8 @@ class HttpCache implements HttpKernelInterface, TerminableInterface
      * All backend requests (cache passes, fetches, cache validations)
      * run through this method.
      *
-     * @param Request  $request A Request instance
-     * @param bool     $catch   Whether to catch exceptions or not
-     * @param Response $entry   A Response instance (the stale entry if present, null otherwise)
+     * @param bool          $catch Whether to catch exceptions or not
+     * @param Response|null $entry A Response instance (the stale entry if present, null otherwise)
      *
      * @return Response A Response instance
      */
diff --git a/src/Symfony/Component/Intl/Collator/Collator.php b/src/Symfony/Component/Intl/Collator/Collator.php
index 62b1ddc995..a87e0eb228 100644
--- a/src/Symfony/Component/Intl/Collator/Collator.php
+++ b/src/Symfony/Component/Intl/Collator/Collator.php
@@ -70,7 +70,7 @@ class Collator
     const SORT_STRING = 1;
 
     /**
-     * @param string $locale The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
+     * @param string|null $locale The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
      *
      * @throws MethodArgumentValueNotImplementedException When $locale different than "en" or null is passed
      */
@@ -84,7 +84,7 @@ class Collator
     /**
      * Static constructor.
      *
-     * @param string $locale The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
+     * @param string|null $locale The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
      *
      * @return self
      *
diff --git a/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php b/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
index 197a2e3db0..c5e60aee63 100644
--- a/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
+++ b/src/Symfony/Component/Intl/DateFormatter/IntlDateFormatter.php
@@ -118,7 +118,7 @@ class IntlDateFormatter
     private $timeZoneId;
 
     /**
-     * @param string                                  $locale   The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
+     * @param string|null                             $locale   The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
      * @param int|null                                $datetype Type of date formatting, one of the format type constants
      * @param int|null                                $timetype Type of time formatting, one of the format type constants
      * @param \IntlTimeZone|\DateTimeZone|string|null $timezone Timezone identifier
@@ -152,7 +152,7 @@ class IntlDateFormatter
     /**
      * Static constructor.
      *
-     * @param string                                  $locale   The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
+     * @param string|null                             $locale   The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
      * @param int|null                                $datetype Type of date formatting, one of the format type constants
      * @param int|null                                $timetype Type of time formatting, one of the format type constants
      * @param \IntlTimeZone|\DateTimeZone|string|null $timezone Timezone identifier
diff --git a/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php b/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
index 9ba821eac8..5c31bdf554 100644
--- a/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
+++ b/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
@@ -241,13 +241,13 @@ class NumberFormatter
     ];
 
     /**
-     * @param string $locale  The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
-     * @param int    $style   Style of the formatting, one of the format style constants.
-     *                        The only supported styles are NumberFormatter::DECIMAL
-     *                        and NumberFormatter::CURRENCY.
-     * @param string $pattern Not supported. A pattern string in case $style is NumberFormat::PATTERN_DECIMAL or
-     *                        NumberFormat::PATTERN_RULEBASED. It must conform to  the syntax
-     *                        described in the ICU DecimalFormat or ICU RuleBasedNumberFormat documentation
+     * @param string|null $locale  The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en")
+     * @param int         $style   Style of the formatting, one of the format style constants.
+     *                             The only supported styles are NumberFormatter::DECIMAL
+     *                             and NumberFormatter::CURRENCY.
+     * @param string      $pattern Not supported. A pattern string in case $style is NumberFormat::PATTERN_DECIMAL or
+     *                             NumberFormat::PATTERN_RULEBASED. It must conform to  the syntax
+     *                             described in the ICU DecimalFormat or ICU RuleBasedNumberFormat documentation
      *
      * @see http://www.php.net/manual/en/numberformatter.create.php
      * @see http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details