diff --git a/api_docs/changelog.md b/api_docs/changelog.md
index 5c29b3279d..c7db8d19cb 100644
--- a/api_docs/changelog.md
+++ b/api_docs/changelog.md
@@ -1479,6 +1479,8 @@ No changes; feature level used for Zulip 3.0 release.
 
 ## Changes in Zulip 2.1
 
+* [`POST /register`](/api/register-queue): Added
+  `realm_default_external_accounts` to endpoint response.
 * [`GET /messages`](/api/get-messages): Added support for
   [search/narrow options](/api/construct-narrow) that use stream/user
   IDs to specify a message's sender, its stream, and/or its recipient(s).
diff --git a/zerver/openapi/zulip.yaml b/zerver/openapi/zulip.yaml
index 3526e50531..6a7bfd83fc 100644
--- a/zerver/openapi/zulip.yaml
+++ b/zerver/openapi/zulip.yaml
@@ -13220,8 +13220,10 @@ paths:
                           Present if `realm` is present in `fetch_event_types`.
 
                           Dictionary where each entry describes a default external
-                          account type that can be configured with Zulip's custom
-                          profile fields feature.
+                          account type that can be configured with Zulip's [custom
+                          profile fields feature](/help/custom-profile-fields).
+
+                          **Changes**: New in Zulip 2.1.0.
                         additionalProperties:
                           description: |
                             `{site_name}`: Dictionary containing the details of the