diff --git a/package.json b/package.json
index 1283dd7..5af5ace 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,10 @@
   "description": "Markdown-formatted Creative Commons licenses",
   "author": "idleberg",
   "license": "Unlicense",
+  "files": [
+    "4.0/",
+    "legacy/",
+  ],
   "scripts": {
     "lint": "npm run test",
     "test": "remark -u lint ./4.0/*.markdown ./legacy/**/*.markdown"