diff --git a/ChangeLog b/ChangeLog
index 6cae1f1e0b..1b30e07289 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -34,7 +34,7 @@ Tue Dec 13 06:29:39 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 Tue Dec 13 05:50:07 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* vm_insnhelper.c (vm_yield_setup_block_args): splat single
-	  argument if optinal arguments are defined not only mandatory or
+	  argument if optional arguments are defined not only mandatory or
 	  post arguments.  [ruby-core:41557] [Bug #5730]
 
 Mon Dec 12 22:35:39 2011  Shugo Maeda  <shugo@ruby-lang.org>