diff --git a/editor-support/vim/syntax/str.vim b/editor-support/vim/syntax/str.vim
index d0962e1..ce4cf06 100644
--- a/editor-support/vim/syntax/str.vim
+++ b/editor-support/vim/syntax/str.vim
@@ -8,7 +8,7 @@ endif
 
 " Keywords (commands)
 syn keyword strKeyword exit paste copy infile outfile assign clear show undo redo history edit save load runfile script
-syn keyword strKeyword enclose lower upper lsub rsub prefix suffix quote unquote replace rev trim indent concat
+syn keyword strKeyword enclose lower upper lsub rsub prefix suffix quote unquote replace rev trim indent concat exists
 syn keyword strKeyword line word each on drop take missing lines words split chunk join sort unique zip flatten group
 syn match   strKeyword "\<contains\>"
 syn keyword strKeyword to from set over call lipsum convert if unless while table push