diff --git a/be/src/exec/parquet_schema_builder.cpp b/be/src/exec/parquet_schema_builder.cpp
index 0d19cf5f7436f..f582520ed9da5 100644
--- a/be/src/exec/parquet_schema_builder.cpp
+++ b/be/src/exec/parquet_schema_builder.cpp
@@ -226,6 +226,8 @@ static Status get_parquet_type_from_map(const ::parquet::schema::NodePtr& node,
 /*
 try to infer struct type from group node.
 
+parquet does not have struct type, there is no struct definition in parquet.
+try to infer like this.
 group <name> {
     type field0;
     type field1;