diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md
index 4d4694c0eb..f1e5595bf5 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -318,6 +318,16 @@ Example configuration:
 include_profile_data_on_invite: false
 ```
 ---
+### `include_profile_updates_in_sync`
+
+*(boolean)* Use this option to include updates of other users profiles in sync responses, for users who share rooms.
+Note, requires an MSC4429 compatible client, and is currently limited to legacy sync and local users only. Defaults to `false`.
+
+Example configuration:
+```yaml
+include_profile_updates_in_sync: true
+```
+---
 ### `allow_public_rooms_without_auth`
 
 *(boolean)* If set to true, removes the need for authentication to access the server's public rooms directory through the client API, meaning that anyone can query the room directory. Defaults to `false`.
diff --git a/schema/synapse-config.schema.yaml b/schema/synapse-config.schema.yaml
index 8a889339b4..a3c792d135 100644
--- a/schema/synapse-config.schema.yaml
+++ b/schema/synapse-config.schema.yaml
@@ -235,6 +235,17 @@ properties:
     default: true
     examples:
       - false
+  include_profile_updates_in_sync:
+    type: boolean
+    description: >-
+      Use this option to include updates of other users profiles in sync responses,
+      for users who share rooms.
+      
+      Note, requires an MSC4429 compatible client, and is currently limited to
+      legacy sync and local users only.
+    default: false
+    examples:
+      - true
   allow_public_rooms_without_auth:
     type: boolean
     description: