diff --git a/package.json b/package.json
index 1faed78..7d6f173 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   },
   "keywords": [
     "koa",
+    "middleware",
     "nunjucks"
   ],
   "author": "Xu Jin",