diff --git a/NEWS b/NEWS
index 32480e014f..116b34a2a3 100644
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,8 @@ with all sufficient information, see the ChangeLog file.
     * incompatible changes:
       * system() and exec() closes non-standard file descriptors
         (The default of :close_others option is changed to true by default.)
+      * respond_to? against a protected method now returns false unless
+        the second argument is true.
 
   * Signal
     * incompatible changes:
@@ -72,3 +74,6 @@ with all sufficient information, see the ChangeLog file.
     Also, the close-on-exec flag is set by default for all new file descriptors.
     This means file descriptors doesn't inherit to spawned process unless
     explicitly requested such as system(..., fd=>fd).
+
+  * Kernel#respond_to? against a protected method now returns false
+    unless the second argument is true.