diff --git a/ajax/libs/prototype/package.json b/ajax/libs/prototype/package.json
index b8ec41663df4d0..890fce7ad339c0 100644
--- a/ajax/libs/prototype/package.json
+++ b/ajax/libs/prototype/package.json
@@ -12,5 +12,6 @@
   "repository": {
     "type": "git",
     "url": "https://github.com/sstephenson/prototype.git"
-  }
+  },
+  "license": "MIT"
 }