diff --git a/news/1585.feature b/news/1585.feature
new file mode 100644
index 0000000000..c76f0c559a
--- /dev/null
+++ b/news/1585.feature
@@ -0,0 +1,2 @@
+Add `UID` to the metadata for summaries, for example related items.
+[maurits]
diff --git a/src/plone/restapi/serializer/summary.py b/src/plone/restapi/serializer/summary.py
index 64768ecfda..398d1e4c3a 100644
--- a/src/plone/restapi/serializer/summary.py
+++ b/src/plone/restapi/serializer/summary.py
@@ -21,6 +21,7 @@ def default_metadata_fields(self):
             "description",
             "review_state",
             "title",
+            "UID",
         }
 
     def field_accessors(self):