diff --git a/ChangeLog b/ChangeLog
index 25ecaf1558..27e10e18bf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jun  7 07:17:00 2013  Kenta Murata  <mrkn@mrkn.jp>
+
+	* NEWS: describe a compatibility issue of Numeric#quo
+	  introduced at r41109.
+
 Fri Jun  7 07:15:00 2013  Kenta Murata  <mrkn@mrkn.jp>
 
 	* NEWS: fix style.
diff --git a/NEWS b/NEWS
index a4e057bbd0..72662cff59 100644
--- a/NEWS
+++ b/NEWS
@@ -51,6 +51,10 @@ with all sufficient information, see the ChangeLog file.
   * The ancestors of a singleton class now include singleton classes,
     in particular itself.
 
+* Numeric#quo
+  * Raises TypeError instead of ArgumentError if the receiver doesn't have
+    to_r method.
+
 === Stdlib updates (outstanding ones only)
 
 * Digest