diff --git a/README.md b/README.md
index 146480b..b24e16b 100644
--- a/README.md
+++ b/README.md
@@ -55,3 +55,6 @@ Script would generate YOLO format text label and image under **labelme_json_dir*
 /home/username/labelme_json_dir/2.text
 /home/username/labelme_json_dir/2.png
 ```
+
+
+**Only tested on Centos 7/Python 3.6 environment.**