diff --git a/grammars/javascript.cson b/grammars/javascript.cson
index 3ec2e5ce..09b456cb 100644
--- a/grammars/javascript.cson
+++ b/grammars/javascript.cson
@@ -2,6 +2,7 @@
 'fileTypes': [
   'js'
   '_js'
+  'cjs'
   'es'
   'es6'
   'gs'