diff --git a/src/pgp.rs b/src/pgp.rs
index e2f546f4e..a7cf4add3 100644
--- a/src/pgp.rs
+++ b/src/pgp.rs
@@ -1,4 +1,4 @@
-//! OpenPGP helper module
+//! OpenPGP helper module using [rPGP facilities](https://github.com/rpgp/rpgp)
 
 use std::collections::{BTreeMap, HashSet};
 use std::convert::TryInto;