diff --git a/README.md b/README.md
index 4547fe5..83debb6 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,11 @@ An identity for developers on the web.
 
 ## What is thedev.id
 
-**thedev.id** is a free identity for developers on the web. This service offers a handy subdomain like `foo.thedev.id` or `bar.thedev.id` for use on your static sites via CNAME. Fork, add subdomain and send a Pull Request. We will make it work.
+**thedev.id** is a free identity for developers on the web. This service offers a handy subdomain like `foo.thedev.id` or `bar.thedev.id` for use on your static sites via [CNAME record](https://en.wikipedia.org/wiki/CNAME_record). Fork, add subdomain and send a Pull Request. We will make it work.
 
 ## How to get one
 
 - Fork this repo.
-- Add a CNAME to your [GitHub Pages](https://pages.github.com).
+- Set a custom domain to your [GitHub Pages](https://pages.github.com).
 - Add your subdomain under `subdomains.json` file.
 - Send Pull Request.