diff --git a/discovery.md b/discovery.md
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+++ b/discovery.md
@@ -1,4 +1,8 @@
 Discovery
 =========
 
-...to be written
+# GitHub
+
+Their GPG Public Key is returned by appending `.gpg` to their GitHub User URL i.e. https://github.com/${user}.gpg
+
+For example, https://github.com/cmlh.gpg returns the GPG Public Key of GitHub account `cmlh`