diff --git a/browser.js b/browser.js
new file mode 100644
index 0000000..15a372e
--- /dev/null
+++ b/browser.js
@@ -0,0 +1 @@
+throw new Error("NOT IMPLEMENTED");
diff --git a/package.json b/package.json
index adf4bbc..d55e706 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,8 @@
     "Anatol Sommer <anatol@anatol.at>",
     "AJ ONeal <aj@daplie.com>"
   ],
+  "main": "node.js",
+  "browser": "browser.js",
   "license": "MPL-2.0",
   "repository": {
     "type": "git",