diff --git a/ChangeLog b/ChangeLog
index 06b58ae493..cf440dcd8f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun Aug  1 10:23:48 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* lib/irb/init.rb (IRB.parse_opts): set VERBOSE to true when debug
+	  switch called in irb.  a patch from Andrew Grimm in
+	  [ruby-core:31558].
+
 Sun Aug  1 09:35:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* bignum.c (big_op): comparison of bignum and infinity has returned 1
diff --git a/lib/irb/init.rb b/lib/irb/init.rb
index d428850e3f..5c1d56e980 100644
--- a/lib/irb/init.rb
+++ b/lib/irb/init.rb
@@ -135,6 +135,7 @@ module IRB
 	@CONF[:MATH_MODE] = true
       when "-d"
 	$DEBUG = true
+	$VERBOSE = true
       when "-w"
 	$VERBOSE = true
       when /^-W(.+)?/