diff --git a/paddle/cinn/api/op_topo_pattern.h b/paddle/cinn/api/op_topo_pattern.h
index 47c7f2b225fec..8febb35a20e6e 100644
--- a/paddle/cinn/api/op_topo_pattern.h
+++ b/paddle/cinn/api/op_topo_pattern.h
@@ -16,6 +16,7 @@ struct ReductionPattern {};
 template <typename T>
 struct PartialShardablePattern {};
 
+// SR := [R | PS]
 template <typename T>
 using ShardableReductionsPattern = std::vector<std::variant<ReductionPattern<T>, PartialShardablePattern<T>>>;