diff --git a/FEDERATION.md b/FEDERATION.md
index aa92214e..20bf90f4 100644
--- a/FEDERATION.md
+++ b/FEDERATION.md
@@ -65,6 +65,7 @@ This document **MAY** alias JSON-LD namespace IRIs to their well-known aliases.
         * `as:quoteUrl`
 - [FEP-67ff: FEDERATION.md](https://codeberg.org/fediverse/fep/src/branch/main/fep/67ff/fep-67ff.md)
 - [FEP-2c59: Discovery of a Webfinger address from an ActivityPub actor](https://codeberg.org/fediverse/fep/src/branch/main/fep/2c59/fep-2c59.md)
+- [FEP-9fde: Mechanism for servers to expose supported operations](https://codeberg.org/fediverse/fep/src/branch/main/fep/9fde/fep-9fde.md)
 
 ## FEPs we intend to support in the future
 - [FEP-8fcf: Followers collection synchronization across servers](https://codeberg.org/fediverse/fep/src/branch/main/fep/8fcf/fep-8fcf.md)