diff --git a/src/_knife b/src/_knife
index be55e56..7f56a4c 100644
--- a/src/_knife
+++ b/src/_knife
@@ -44,7 +44,7 @@ _knife() {
   
   case $state in
   knifecmd)
-    compadd -Q "$@" bootstrap client configure cookbook "cookbook site" "data bag" environment user exec index node recipe role search ssh status windows $cloudproviders
+    compadd -Q "$@" bootstrap client configure cookbook "cookbook site" "data bag" diff environment user exec index node recipe role search ssh status windows $cloudproviders
   ;;
   knifesubcmd)
     case $words[2] in
@@ -60,6 +60,9 @@ _knife() {
     cookbook)
       compadd -Q "$@" test list create download delete "metadata from" show "bulk delete" metadata upload
     ;;
+    diff)
+      _arguments '*:file or directory:_files -g "*.(rb|json)"'
+    ;;
     environment)
       compadd -Q "$@" create delete edit "from file" list show
     ;;