small adjustments

snippets/snippet-mode/vars

@@ -1,9 +1,11 @@
+# -*- mode: snippet -*-
 # name : Snippet header
 # contributor : joaotavora
 # --
 # name : $1${2:
-# key : ${3:expand-key}}${4:
-# group : ${5:group}} 
+# key : ${3:trigger-key}}${4:
+# keybinding : ${5:keybinding}}${6:
+# expand-env : (${7:})}
 # contributor : $6
 # --
 $0