diff --git a/changelog.d/19508.doc b/changelog.d/19508.doc
new file mode 100644
index 0000000000..2550116341
--- /dev/null
+++ b/changelog.d/19508.doc
@@ -0,0 +1 @@
+Added details about how Synapse syncs the picture claim when `update_profile_information` setting is true.
diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md
index e58a2dcf10..d028d65fe3 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -3788,7 +3788,10 @@ This setting has the following sub-options:
 
   Defaults to `null`.
 
-* `update_profile_information` (boolean): Use this setting to keep a user's profile fields in sync with information from the identity provider. Currently only syncing the displayname is supported. Fields are checked on every SSO login, and are updated if necessary. Note that enabling this option will override user profile information, regardless of whether users have opted-out of syncing that information when first signing in. Defaults to `false`.
+* `update_profile_information` (boolean): Use this setting to keep a user's profile fields in sync with information from the identity provider. Fields are checked on every  SSO login, and are updated if necessary. Note that enabling this  option will override user profile information, regardless of whether  users have opted-out of syncing that information when first signing  in. Fields that will be synced:
+    * displayname
+    * picture - only if Synapse media repository is running in the main
+       process (i.e. not workerized) and media is stored locally Defaults to `false`.
 
 Example configuration:
 ```yaml
diff --git a/schema/synapse-config.schema.yaml b/schema/synapse-config.schema.yaml
index 8888d2c673..8b8d57b9bf 100644
--- a/schema/synapse-config.schema.yaml
+++ b/schema/synapse-config.schema.yaml
@@ -4620,11 +4620,15 @@ properties:
         type: boolean
         description: >-
           Use this setting to keep a user's profile fields in sync with
-          information from the identity provider. Currently only syncing the
-          displayname is supported. Fields are checked on every SSO login, and
-          are updated if necessary. Note that enabling this option will override
-          user profile information, regardless of whether users have opted-out
-          of syncing that information when first signing in.
+          information from the identity provider. Fields are checked on every 
+          SSO login, and are updated if necessary. Note that enabling this 
+          option will override user profile information, regardless of whether 
+          users have opted-out of syncing that information when first signing 
+          in.
+          Fields that will be synced:
+            * displayname
+            * picture - only if Synapse media repository is running in the main
+               process (i.e. not workerized) and media is stored locally
         default: false
     examples:
       - client_whitelist: