diff --git a/acs.vim b/acs.vim
index 2218db8..4daaa6e 100644
--- a/acs.vim
+++ b/acs.vim
@@ -12,7 +12,7 @@ hi def link language_keywords Keyword
 syn keyword script_types OPEN ENTER RETURN RESPAWN DEATH LIGHTNING UNLOADING DISCONNECT KILL REOPEN net
 hi def link script_types Keyword
 
-syn keyword types int str bool
+syn keyword types int str bool void
 hi def link types Type
 
 syn keyword TODO TODO FIXME XXX