diff --git a/src/components/recorder.vue b/src/components/recorder.vue
index 4622580..9c90f7b 100644
--- a/src/components/recorder.vue
+++ b/src/components/recorder.vue
@@ -273,7 +273,8 @@
       failedUpload     : { type: Function },
       beforeUpload     : { type: Function },
       successfulUpload : { type: Function },
-      selectRecord     : { type: Function }
+      selectRecord     : { type: Function },
+      format     : { type: String }
     },
     data () {
       return {