diff --git a/content/spec.md b/content/spec.md
index db94ed8..eca5570 100644
--- a/content/spec.md
+++ b/content/spec.md
@@ -7,3 +7,9 @@ title: "WebFinger Specifications"
 
 * WebFinger Spec: [rfc7033](https://tools.ietf.org/html/rfc7033)
 * The 'acct' URI Scheme Spec: [rfc7565](https://tools.ietf.org/html/rfc7565)
+
+## Extensions ##
+
+* ActivityPub and WebFinger: [W3C Draft Community Group Report](https://swicg.github.io/activitypub-webfinger/)
+* Dereferencing identifiers with WebFinger: [FEP-4adb](https://codeberg.org/fediverse/fep/src/branch/main/fep/4adb/fep-4adb.md)
+* Discovery of a WebFinger address from an ActivityPub actor: [FEP-2c59](https://codeberg.org/fediverse/fep/src/branch/main/fep/2c59/fep-2c59.md)
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