diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/MoneyToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/MoneyToLocalizedStringTransformer.php
index ca341ac712..18341b0677 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/MoneyToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/MoneyToLocalizedStringTransformer.php
@@ -45,7 +45,7 @@ class MoneyToLocalizedStringTransformer extends NumberToLocalizedStringTransform
     /**
      * Transforms a normalized format into a localized money string.
      *
-     * @param int|float $value Normalized number
+     * @param int|float|null $value Normalized number
      *
      * @return string Localized money string
      *
@@ -69,7 +69,7 @@ class MoneyToLocalizedStringTransformer extends NumberToLocalizedStringTransform
      *
      * @param string $value Localized money string
      *
-     * @return int|float Normalized number
+     * @return int|float|null Normalized number
      *
      * @throws TransformationFailedException if the given value is not a string
      *                                       or if the value can not be transformed
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
index 84ad6d18e1..7cf46d17c3 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php
@@ -98,7 +98,7 @@ class NumberToLocalizedStringTransformer implements DataTransformerInterface
     /**
      * Transforms a number type into localized number.
      *
-     * @param int|float $value Number value
+     * @param int|float|null $value Number value
      *
      * @return string Localized value
      *
@@ -133,7 +133,7 @@ class NumberToLocalizedStringTransformer implements DataTransformerInterface
      *
      * @param string $value The localized value
      *
-     * @return int|float The numeric value
+     * @return int|float|null The numeric value
      *
      * @throws TransformationFailedException if the given value is not a string
      *                                       or if the value can not be transformed