diff --git a/api/keto/acl/v1alpha1/write_service.proto b/api/keto/acl/v1alpha1/write_service.proto
index c74e19a0d..bd5982a9f 100644
--- a/api/keto/acl/v1alpha1/write_service.proto
+++ b/api/keto/acl/v1alpha1/write_service.proto
@@ -54,7 +54,7 @@ message WriteRelationTuplesResponse {
   // with the same index as specified in the `relation_tuple_deltas` field of
   // the WriteRelationTuplesRequest request.
   //
-  // The snaptoken is nil at the same index
-  // if the RelationTupleWriteDelta_Action was DELETE.
+  // If the RelationTupleWriteDelta_Action was DELETE
+  // the snaptoken is empty at the same index.
   repeated string snaptokens = 1;
 }