diff --git a/dsRag/Test/T9_TestReadPDF.py b/dsRag/Test/T9_TestReadPDF.py
index 9f08f4e3..fec57f58 100644
--- a/dsRag/Test/T9_TestReadPDF.py
+++ b/dsRag/Test/T9_TestReadPDF.py
@@ -2,6 +2,7 @@
 conda activate rag
 pip install PyPDF2
 
+https://www.jianshu.com/p/d893d3dfd65a
 https://www.jianshu.com/p/d893d3dfd65a
 """
 from Util.PdfUtil import read_pdf_file