diff --git a/index.js b/coretool.js
similarity index 100%
rename from index.js
rename to coretool.js
diff --git a/package.json b/package.json
index 34c6c79..f2ee8e8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "name": "core.tool",
   "version": "0.1.0",
+  "main": "coretool.js",
   "private": true,
   "dependencies": {
   },