diff --git a/src/_mix b/src/_mix
index bb4233f..c92432c 100644
--- a/src/_mix
+++ b/src/_mix
@@ -163,6 +163,7 @@ __task_list ()
         'escript.uninstall'
         'gettext.extract'
         'gettext.merge'
+        'format'
         'help'
         'hex'
         'hex.build'
@@ -230,6 +231,10 @@ case $state in
          _arguments ':PATH:_files'
          return
       ;;
+      (format)
+         _arguments ':PATH:_files'
+         return
+      ;;
     esac
   ;;
 esac