diff --git a/ChangeLog b/ChangeLog
index 9cfe54e820..d973e81689 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Nov 07 01:14:22 2011  Ayumu AIZAWA  <ayumu.aizawa@gmail.com>
+
+	* lib/debug.rb: add help for 'pp' and 'r[estart]'. patch
+	  from Sho Hashimoto. [Bug #5093] [ruby-dev:44222]
+
 Sun Nov  6 14:49:58 2011  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/rubysocket.h (rsock_recvmsg): declared.
diff --git a/lib/debug.rb b/lib/debug.rb
index e99f69826a..3f61bc79fa 100644
--- a/lib/debug.rb
+++ b/lib/debug.rb
@@ -545,7 +545,9 @@ Commands
   th[read] [sw[itch]] <nnn>  switch thread context to nnn
   th[read] stop <nnn>        stop thread nnn
   th[read] resume <nnn>      resume thread nnn
+  pp expression              evaluate expression and pretty_print its value
   p expression               evaluate expression and print its value
+  r[estart]                  restart program
   h[elp]                     print this help
   <everything else>          evaluate
 EOHELP