diff --git a/README.md b/README.md
index 0eaa983..69af04e 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,31 @@ This is useful for **certbot** and **letsencrypt**.
 
 (in the future we'd like to provide the same API to the browser)
 
+Install
+=======
+
+```
+# node.js
+npm install --save rsa-compat
+
+# CLI
+npm install --global rsa-compat
+```
+
+
+Usage
+=====
+
+CLI
+---
+
+You can generate keypairs on Windows, Mac, and Linux using rsa-keygen-js:
+
+```bash
+# generates a new keypair in the current directory
+rsa-keypiar-js
+```
+
 Examples
 --------
 
diff --git a/bin/rsa-keygen.js b/bin/rsa-keygen.js
new file mode 100755
index 0000000..e65176f
--- /dev/null
+++ b/bin/rsa-keygen.js
@@ -0,0 +1,35 @@
+#!/usr/bin/env node
+'use strict';
+
+var RSA = require('../').RSA;
+var path = require('path');
+var fs = require('fs');
+
+var bitlen = 2048;
+var exp = 65537;
+var opts = { public: true, pem: true };
+var cwd = process.cwd();
+var privkeyPath = path.join(cwd, 'privkey.pem');
+var pubkeyPath = path.join(cwd, 'pubkey.pem');
+
+if (fs.existsSync(privkeyPath)) {
+  console.error(privkeyPath, "already exists");
+  process.exit(1);
+}
+
+RSA.generateKeypair(bitlen, exp, opts, function (err, keypair) {
+  console.info('');
+  console.info('');
+
+  fs.writeFileSync(privkeyPath, keypair.privateKeyPem, 'ascii');
+  console.info(privkeyPath + ':');
+  console.info('');
+  console.info(keypair.privateKeyPem);
+
+  console.info('');
+
+  fs.writeFileSync(pubkeyPath, keypair.publicKeyPem, 'ascii');
+  console.info(pubkeyPath + ':');
+  console.info('');
+  console.info(keypair.publicKeyPem);
+});
diff --git a/package.json b/package.json
index 7e507ac..7261ab1 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,9 @@
   "version": "1.2.6",
   "description": "RSA utils that work on Windows, Mac, and Linux with or without C compiler",
   "main": "node.js",
+  "bin": {
+    "rsa-keygen-js": "bin/rsa-keygen.js"
+  },
   "scripts": {
     "test": "node tests"
   },
@@ -36,7 +39,7 @@
   },
   "homepage": "https://github.com/Daplie/rsa-compat.js#readme",
   "dependencies": {
-    "buffer-v6-polyfill": "^1.0.1",
+    "buffer-v6-polyfill": "^1.0.3",
     "node-forge": "^0.6.41"
   },
   "optionalDependencies": {