diff --git a/Normalizer/ArrayDenormalizer.php b/Normalizer/ArrayDenormalizer.php
index 759dbcd88..65b1c2e82 100644
--- a/Normalizer/ArrayDenormalizer.php
+++ b/Normalizer/ArrayDenormalizer.php
@@ -35,6 +35,8 @@ class ArrayDenormalizer implements ContextAwareDenormalizerInterface, Serializer
      * {@inheritdoc}
      *
      * @throws NotNormalizableValueException
+     *
+     * @return array
      */
     public function denormalize($data, $type, $format = null, array $context = [])
     {
diff --git a/Normalizer/ConstraintViolationListNormalizer.php b/Normalizer/ConstraintViolationListNormalizer.php
index 36373d9f5..81a5416ff 100644
--- a/Normalizer/ConstraintViolationListNormalizer.php
+++ b/Normalizer/ConstraintViolationListNormalizer.php
@@ -40,6 +40,8 @@ public function __construct($defaultContext = [], NameConverterInterface $nameCo
 
     /**
      * {@inheritdoc}
+     *
+     * @return array
      */
     public function normalize($object, $format = null, array $context = [])
     {
diff --git a/Normalizer/DataUriNormalizer.php b/Normalizer/DataUriNormalizer.php
index 87bb96aad..4646d6ce0 100644
--- a/Normalizer/DataUriNormalizer.php
+++ b/Normalizer/DataUriNormalizer.php
@@ -61,6 +61,8 @@ public function __construct($mimeTypeGuesser = null)
 
     /**
      * {@inheritdoc}
+     *
+     * @return string
      */
     public function normalize($object, $format = null, array $context = [])
     {
@@ -102,6 +104,8 @@ public function supportsNormalization($data, $format = null)
      *
      * @throws InvalidArgumentException
      * @throws NotNormalizableValueException
+     *
+     * @return \SplFileInfo
      */
     public function denormalize($data, $type, $format = null, array $context = [])
     {
diff --git a/Normalizer/DateIntervalNormalizer.php b/Normalizer/DateIntervalNormalizer.php
index c4b7c55ab..31cadaa88 100644
--- a/Normalizer/DateIntervalNormalizer.php
+++ b/Normalizer/DateIntervalNormalizer.php
@@ -46,6 +46,8 @@ public function __construct($defaultContext = [])
      * {@inheritdoc}
      *
      * @throws InvalidArgumentException
+     *
+     * @return string
      */
     public function normalize($object, $format = null, array $context = [])
     {
@@ -77,6 +79,8 @@ public function hasCacheableSupportsMethod(): bool
      *
      * @throws InvalidArgumentException
      * @throws UnexpectedValueException
+     *
+     * @return \DateInterval
      */
     public function denormalize($data, $type, $format = null, array $context = [])
     {
diff --git a/Normalizer/DateTimeNormalizer.php b/Normalizer/DateTimeNormalizer.php
index 34e1083bc..996700cf1 100644
--- a/Normalizer/DateTimeNormalizer.php
+++ b/Normalizer/DateTimeNormalizer.php
@@ -57,6 +57,8 @@ public function __construct($defaultContext = [], \DateTimeZone $timezone = null
      * {@inheritdoc}
      *
      * @throws InvalidArgumentException
+     *
+     * @return string
      */
     public function normalize($object, $format = null, array $context = [])
     {
@@ -87,6 +89,8 @@ public function supportsNormalization($data, $format = null)
      * {@inheritdoc}
      *
      * @throws NotNormalizableValueException
+     *
+     * @return \DateTimeInterface
      */
     public function denormalize($data, $type, $format = null, array $context = [])
     {
diff --git a/Normalizer/DateTimeZoneNormalizer.php b/Normalizer/DateTimeZoneNormalizer.php
index 519381b22..108039324 100644
--- a/Normalizer/DateTimeZoneNormalizer.php
+++ b/Normalizer/DateTimeZoneNormalizer.php
@@ -25,6 +25,8 @@ class DateTimeZoneNormalizer implements NormalizerInterface, DenormalizerInterfa
      * {@inheritdoc}
      *
      * @throws InvalidArgumentException
+     *
+     * @return string
      */
     public function normalize($object, $format = null, array $context = [])
     {
@@ -47,6 +49,8 @@ public function supportsNormalization($data, $format = null)
      * {@inheritdoc}
      *
      * @throws NotNormalizableValueException
+     *
+     * @return \DateTimeZone
      */
     public function denormalize($data, $type, $format = null, array $context = [])
     {
diff --git a/Normalizer/ProblemNormalizer.php b/Normalizer/ProblemNormalizer.php
index 17f4500f2..ca7b78b5c 100644
--- a/Normalizer/ProblemNormalizer.php
+++ b/Normalizer/ProblemNormalizer.php
@@ -37,6 +37,8 @@ public function __construct(bool $debug = false, array $defaultContext = [])
 
     /**
      * {@inheritdoc}
+     *
+     * @return array
      */
     public function normalize($exception, $format = null, array $context = [])
     {