diff --git a/changelogs/server_server/newsfragments/3312.clarification b/changelogs/server_server/newsfragments/3312.clarification
new file mode 100644
index 00000000..a9e1fe8d
--- /dev/null
+++ b/changelogs/server_server/newsfragments/3312.clarification
@@ -0,0 +1 @@
+Correct the `/_matrix/federation/v1/user/devices/{userId}` response which actually returns `"self_signing_key"` instead of `"self_signing_keys"`.
diff --git a/data/api/server-server/user_devices.yaml b/data/api/server-server/user_devices.yaml
index 0c2348da..9fb15777 100644
--- a/data/api/server-server/user_devices.yaml
+++ b/data/api/server-server/user_devices.yaml
@@ -96,7 +96,7 @@ paths:
                         "ed25519:base64+master+public+key": "base64+master+public+key",
                       }
                     }
-              self_signing_keys:
+              self_signing_key:
                 type: object
                 description: |-
                   The user\'s self-signing key.