diff --git a/NEWS b/NEWS
index 3b4d66b6fd..7a6c82661f 100644
--- a/NEWS
+++ b/NEWS
@@ -106,6 +106,11 @@ with all sufficient information, see the ChangeLog file.
 
 * Regexp/String: Updated Unicode version from 7.0.0 to 8.0.0
 
+* String
+
+  * String#+@ and String#- are added to get mutable/frozen strings.
+    [Feature #11782]
+
 * Struct
   * Struct#dig [Feature #11688]