diff --git a/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php b/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
index 3c3ea1aa17..3a5c4f0c4b 100644
--- a/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
+++ b/src/Symfony/Component/Security/Core/Encoder/BasePasswordEncoder.php
@@ -48,8 +48,8 @@ abstract class BasePasswordEncoder implements PasswordEncoderInterface
     /**
      * Merges a password and a salt.
      *
-     * @param string $password The password to be used
-     * @param string $salt     The salt to be used
+     * @param string      $password The password to be used
+     * @param string|null $salt     The salt to be used
      *
      * @return string a merged password and salt
      *
diff --git a/src/Symfony/Component/Security/Core/Encoder/PasswordEncoderInterface.php b/src/Symfony/Component/Security/Core/Encoder/PasswordEncoderInterface.php
index e0573051eb..03cdaca44a 100644
--- a/src/Symfony/Component/Security/Core/Encoder/PasswordEncoderInterface.php
+++ b/src/Symfony/Component/Security/Core/Encoder/PasswordEncoderInterface.php
@@ -23,8 +23,8 @@ interface PasswordEncoderInterface
     /**
      * Encodes the raw password.
      *
-     * @param string $raw  The password to encode
-     * @param string $salt The salt
+     * @param string      $raw  The password to encode
+     * @param string|null $salt The salt
      *
      * @return string The encoded password
      *
@@ -36,9 +36,9 @@ interface PasswordEncoderInterface
     /**
      * Checks a raw password against an encoded password.
      *
-     * @param string $encoded An encoded password
-     * @param string $raw     A raw password
-     * @param string $salt    The salt
+     * @param string      $encoded An encoded password
+     * @param string      $raw     A raw password
+     * @param string|null $salt    The salt
      *
      * @return bool true if the password is valid, false otherwise
      *