diff --git a/doc/releases/release-notes-4.2.rst b/doc/releases/release-notes-4.2.rst
index 5e4230955ce..7f4213339cc 100644
--- a/doc/releases/release-notes-4.2.rst
+++ b/doc/releases/release-notes-4.2.rst
@@ -102,6 +102,12 @@ New APIs and options
 
     * LE Connection Subrating is no longer experimental.
 
+* Networking:
+
+  * IPv4
+
+    * :kconfig:option:`CONFIG_NET_IPV4_MTU`
+
 * Stepper
 
   * :c:func:`stepper_stop()`