diff --git a/coope.sty b/coope.sty
index 97c8391..0d9cbd2 100644
--- a/coope.sty
+++ b/coope.sty
@@ -25,7 +25,8 @@
   keywords={%
     undefined,null,true,false,NaN,Infinity,return,%
     try,catch,finally,function,var,if,then,else,%
-    in,while,do,done,case,break,continue,new,typeof%
+    in,while,do,done,case,break,continue,%
+    new,typeof,void,in,instanceof%
   },
   keywordstyle=\color{gray},
   comment=[l]{//},