diff --git a/package.json b/package.json
index 68f832d..8a7733e 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,12 @@
   "description": "HTTP/2 auto-push middleware for fastify",
   "main": "build/src/index.js",
   "types": "build/src/index",
+  "files": [
+    "CONTRIBUTING.md",
+    "LICENSE",
+    "README.md",
+    "build/src"
+  ],
   "scripts": {
     "test": "nyc ava",
     "codecov": "nyc report --reporter=json && codecov -f coverage/*.json",