diff --git a/README.md b/README.md
index 6d983fc..c3e4ca4 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![GoDoc](https://godoc.org/github.com/emersion/go-pgpmime?status.svg)](https://godoc.org/github.com/emersion/go-pgpmime)
 
-A PGP/MIME library written in Go
+A [PGP/MIME](https://tools.ietf.org/html/rfc3156) library written in Go
 
 ## License