diff --git a/gobject/genums.c b/gobject/genums.c
index 7fb2521a2..86a8b73f4 100644
--- a/gobject/genums.c
+++ b/gobject/genums.c
@@ -392,7 +392,7 @@ g_flags_class_init (GFlagsClass *class,
  *
  * Looks up a #GEnumValue by name.
  *
- * Returns: (transfer none): the #GEnumValue with name @name,
+ * Returns: (transfer none) (nullable): the #GEnumValue with name @name,
  *          or %NULL if the enumeration doesn't have a member
  *          with that name
  */
@@ -422,7 +422,7 @@ g_enum_get_value_by_name (GEnumClass  *enum_class,
  *
  * Looks up a #GFlagsValue by name.
  *
- * Returns: (transfer none): the #GFlagsValue with name @name,
+ * Returns: (transfer none) (nullable): the #GFlagsValue with name @name,
  *          or %NULL if there is no flag with that name
  */
 GFlagsValue*
@@ -451,7 +451,7 @@ g_flags_get_value_by_name (GFlagsClass *flags_class,
  *
  * Looks up a #GEnumValue by nickname.
  *
- * Returns: (transfer none): the #GEnumValue with nickname @nick,
+ * Returns: (transfer none) (nullable): the #GEnumValue with nickname @nick,
  *          or %NULL if the enumeration doesn't have a member
  *          with that nickname
  */
@@ -481,7 +481,7 @@ g_enum_get_value_by_nick (GEnumClass  *enum_class,
  *
  * Looks up a #GFlagsValue by nickname.
  *
- * Returns: (transfer none): the #GFlagsValue with nickname @nick,
+ * Returns: (transfer none) (nullable): the #GFlagsValue with nickname @nick,
  *          or %NULL if there is no flag with that nickname
  */
 GFlagsValue*
@@ -510,7 +510,7 @@ g_flags_get_value_by_nick (GFlagsClass *flags_class,
  *
  * Returns the #GEnumValue for a value.
  *
- * Returns: (transfer none): the #GEnumValue for @value, or %NULL
+ * Returns: (transfer none) (nullable): the #GEnumValue for @value, or %NULL
  *          if @value is not a member of the enumeration
  */
 GEnumValue*
@@ -538,7 +538,7 @@ g_enum_get_value (GEnumClass *enum_class,
  *
  * Returns the first #GFlagsValue which is set in @value.
  *
- * Returns: (transfer none): the first #GFlagsValue which is set in
+ * Returns: (transfer none) (nullable): the first #GFlagsValue which is set in
  *          @value, or %NULL if none is set
  */
 GFlagsValue*