diff --git a/acrate-nodeinfo/src/lib.rs b/acrate-nodeinfo/src/lib.rs
index 65ef028..5a11fe2 100644
--- a/acrate-nodeinfo/src/lib.rs
+++ b/acrate-nodeinfo/src/lib.rs
@@ -5,6 +5,7 @@
 //! # Specification
 //! 
 //! - <https://github.com/jhass/nodeinfo/blob/main/PROTOCOL.md>
+//! - <https://codeberg.org/fediverse/fep/src/branch/main/fep/f1d5/fep-f1d5.md>
 
 use serde::Deserialize;