diff --git a/src/Symfony/Component/Console/Input/InputArgument.php b/src/Symfony/Component/Console/Input/InputArgument.php
index d4c5e35627..2330cdc2ea 100644
--- a/src/Symfony/Component/Console/Input/InputArgument.php
+++ b/src/Symfony/Component/Console/Input/InputArgument.php
@@ -86,7 +86,7 @@ class InputArgument
     /**
      * Sets the default value.
      *
-     * @param mixed $default The default value
+     * @param string|string[] $default The default value
      *
      * @throws LogicException When incorrect default value is given
      */
@@ -110,7 +110,7 @@ class InputArgument
     /**
      * Returns the default value.
      *
-     * @return mixed The default value
+     * @return string|string[] The default value
      */
     public function getDefault()
     {
diff --git a/src/Symfony/Component/Console/Input/InputInterface.php b/src/Symfony/Component/Console/Input/InputInterface.php
index 088d1cfb31..354d198e04 100644
--- a/src/Symfony/Component/Console/Input/InputInterface.php
+++ b/src/Symfony/Component/Console/Input/InputInterface.php
@@ -83,7 +83,7 @@ interface InputInterface
      *
      * @param string $name The argument name
      *
-     * @return mixed The argument value
+     * @return string|string[] The argument value
      *
      * @throws InvalidArgumentException When argument given doesn't exist
      */
@@ -120,7 +120,7 @@ interface InputInterface
      *
      * @param string $name The option name
      *
-     * @return mixed The option value
+     * @return string|string[]|bool The option value
      *
      * @throws InvalidArgumentException When option given doesn't exist
      */
diff --git a/src/Symfony/Component/Console/Input/InputOption.php b/src/Symfony/Component/Console/Input/InputOption.php
index 9567876c8a..429c9f037d 100644
--- a/src/Symfony/Component/Console/Input/InputOption.php
+++ b/src/Symfony/Component/Console/Input/InputOption.php
@@ -149,7 +149,7 @@ class InputOption
     /**
      * Sets the default value.
      *
-     * @param mixed $default The default value
+     * @param string|string[]|bool $default The default value
      *
      * @throws LogicException When incorrect default value is given
      */
@@ -173,7 +173,7 @@ class InputOption
     /**
      * Returns the default value.
      *
-     * @return mixed The default value
+     * @return string|string[]|bool The default value
      */
     public function getDefault()
     {