diff --git a/authzed/api/materialize/v0/watchpermissionsets.proto b/authzed/api/materialize/v0/watchpermissionsets.proto
index 636337e..4be994a 100644
--- a/authzed/api/materialize/v0/watchpermissionsets.proto
+++ b/authzed/api/materialize/v0/watchpermissionsets.proto
@@ -217,4 +217,10 @@ message DownloadPermissionSetsResponse {
 
   // timestamp represents the time associated with the returned data revision.
   google.protobuf.Timestamp timestamp = 2;
+
+  // at_revision is the snapshot revision the returned files were produced at,
+  // encoded as a ZedToken. Consumers should pass this token to
+  // WatchPermissionSets as optional_starting_after to resume the stream
+  // immediately after the snapshot without leaving gaps in event history.
+  authzed.api.v1.ZedToken at_revision = 3;
 }
diff --git a/docs/apidocs.swagger.json b/docs/apidocs.swagger.json
index ed350c4..a0ce995 100644
--- a/docs/apidocs.swagger.json
+++ b/docs/apidocs.swagger.json
@@ -1642,6 +1642,10 @@
           "type": "string",
           "format": "date-time",
           "description": "timestamp represents the time associated with the returned data revision."
+        },
+        "atRevision": {
+          "$ref": "#/definitions/ZedToken",
+          "description": "at_revision is the snapshot revision the returned files were produced at,\nencoded as a ZedToken. Consumers should pass this token to\nWatchPermissionSets as optional_starting_after to resume the stream\nimmediately after the snapshot without leaving gaps in event history."
         }
       }
     },