diff --git a/blacksun/libblacksun-dma/dma_symbol/lib/pdb_helper.cpp b/blacksun/libblacksun-dma/dma_symbol/lib/pdb_helper.cpp
index efef041..880473f 100644
--- a/blacksun/libblacksun-dma/dma_symbol/lib/pdb_helper.cpp
+++ b/blacksun/libblacksun-dma/dma_symbol/lib/pdb_helper.cpp
@@ -1,3 +1,5 @@
+//Copied from https://github.com/zouxianyu/query-pdb and made some modifications.
+
 #include "pdb_helper.h"
 
 uint8_t GetLeafSize(PDB::CodeView::TPI::TypeRecordKind kind) {