diff --git a/doc/releases/release-notes-2.5.rst b/doc/releases/release-notes-2.5.rst
index 984da69..f64fe8f 100644
--- a/doc/releases/release-notes-2.5.rst
+++ b/doc/releases/release-notes-2.5.rst
@@ -245,6 +245,8 @@
 
   * MCUmgr
 
+    * Added support for flash devices that have non-0xff erase value.
+
   * updatehub
 
 * Settings