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-rw-r--r--runtime/syntax/help.vim2
1 files changed, 1 insertions, 1 deletions
diff --git a/runtime/syntax/help.vim b/runtime/syntax/help.vim
index b3c7f2a63e..41bb0b1938 100644
--- a/runtime/syntax/help.vim
+++ b/runtime/syntax/help.vim
@@ -59,7 +59,7 @@ syn match helpSpecial "\[N]"
syn match helpSpecial "N N"he=s+1
syn match helpSpecial "Nth"me=e-2
syn match helpSpecial "N-1"me=e-2
-syn match helpSpecial "{[-a-zA-Z0-9'"*+/:%#=[\]<>.,]\+}"
+syn match helpSpecial "{[-_a-zA-Z0-9'"*+/:%#=[\]<>.,]\+}"
syn match helpSpecial "\s\[[-a-z^A-Z0-9_]\{2,}]"ms=s+1
syn match helpSpecial "<[-a-zA-Z0-9_]\+>"
syn match helpSpecial "<[SCM]-.>"