diff --git a/ChangeLog b/ChangeLog
index e6711237a1..a153779156 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,16 +8,6 @@ Sun Dec 13 23:46:10 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* tool/ytab.sed: add parser argument to yy_stack_print too.
 
-Sun Dec 13 23:45:19 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (trace_lex_state): trace lex_state changes if yydebug is
-	  set, and send the messages to rb_stdout.
-
-	* parse.y (rb_parser_printf): store YYPRINTF messages per lines
-	  so that lex_state traces do not mix.
-
-	* tool/ytab.sed: add parser argument to yy_stack_print too.
-
 Sun Dec 13 20:41:16 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (build_lex_state_name, trace_lex_state): lex_state is