diff --git a/ChangeLog b/ChangeLog
index 261c4f7223..36cb3b96c7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,6 @@
 Tue Sep 16 22:23:24 2008  Takeyuki Fujioka  <xibbar@ruby-lang.org>
 
-	* lib/cgi/core.rb: performance improvement. 
+	* lib/cgi/core.rb (CGI#header): performance improvement. 
 	  From CGIAlt http://cgialt.rubyforge.org/
 
 	* test/cgi/test_cgi_header.rb: exception class fixed.