diff --git a/api4cpp/readme.md b/api4cpp/readme.md
index fa81f30..f33f66c 100755
--- a/api4cpp/readme.md
+++ b/api4cpp/readme.md
@@ -7,3 +7,10 @@ To start, you should open the CMakeLists.txt from the root directory.
 
 About files in this directory:
 
+
+aipiaoocr_api.cpp      : the implementation of APIs
+
+
+bpocrapitest.cpp      : the tester
+
+