diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..203d698
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Plus Five Five, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
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diff --git a/README.md b/README.md
index 793ea2c..28f2ed4 100644
--- a/README.md
+++ b/README.md
@@ -2,10 +2,21 @@
 
 This example shows how to use Resend with [Cloudflare Workers](https://workers.cloudflare.com).
 
+## Prerequisites
+
+To get the most out of this guide, you’ll need to:
+
+* [Create an API key](https://resend.com/api-keys)
+* [Verify your domain](https://resend.com/domains)
+
 ## Instructions
 
 1. Go to [dash.cloudflare.com](https://dash.cloudflare.com) and create a new Lambda function using the Node.js 18.x runtime.
 
 2. Paste the `worker.js` code into the browser editor.
 
-3. Click on "Save and deploy" at the top right of the screen.
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+3. Click on "Save and deploy" at the top right of the screen.
+
+## License
+
+MIT License
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