diff --git a/syntax/help_ja.vim b/syntax/help_ja.vim
index 5293499e9..c5ab167e8 100644
--- a/syntax/help_ja.vim
+++ b/syntax/help_ja.vim
@@ -3,3 +3,4 @@ scriptencoding utf-8
 syn match helpVim "Vim バージョン [0-9.a-z]\+"
 syn match helpVim "VIMリファレンス.*"
 syn region helpNotVi start="{Vim" start="{|++\?[A-Za-z0-9_/()]\+|" end="}" contains=helpLeadBlank,helpHyperTextJump
+syn match helpWarning "\<警告:"