diff --git a/messages/4.0.0.md b/messages/4.0.0.md
index 0d7f106..b9e5a10 100644
--- a/messages/4.0.0.md
+++ b/messages/4.0.0.md
@@ -36,4 +36,4 @@ You do not need to do anything else.
 ## Changes
 
 - Fix broking autolink when two or more _ (underscores) used in the title Ref: [#142](https://github.com/naokazuterada/MarkdownTOC/issues/142)
-- Remove duplicate id_replacement patterns in settings file
+- Remove duplicated "id_replacement" patterns in settings file