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-rw-r--r--mu.vim2
1 files changed, 1 insertions, 1 deletions
diff --git a/mu.vim b/mu.vim
index bbbaebec..afe7704b 100644
--- a/mu.vim
+++ b/mu.vim
@@ -53,7 +53,7 @@ syntax match muControl "\<loop\>\|\<loop-if[^ ]*"
 highlight link muControl PreProc
 
 syntax match muKeyword " -> "
-syntax keyword muKeyword fn type var
+syntax keyword muKeyword fn type var sig
 highlight link muKeyword PreProc
 
 syntax match muFunction "\(fn\s*\)\@<=\(\S\+\)"