2 files changed, 15 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index 1f2bf0848c..f74f2e1116 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jul 12 23:41:49 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* NEWS: add a description of Signal.trap change.
+
 Tue Jul 12 20:02:35 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* signal.c (reserved_signal_p): reverted a part of r32523.
diff --git a/NEWS b/NEWS
index 62797effed..b91bf0d25a 100644
--- a/NEWS
+++ b/NEWS
@@ -12,7 +12,17 @@ with all sufficient information, see the ChangeLog file.
 
 === C API updates
 === Library updates (outstanding ones only)
+
+* builtin classes
+
+  * Signal
+    * incompatible changes:
+      * Signal.trap raises ArgumentError when :SEGV, :BUS, :ILL, :FPE, :VTALRM
+        are specified.
+
 === Language changes
 === Compatibility issues (excluding feature bug fixes)
 
-  None
+  * Signal.trap
+
+    See above.