diff --git a/README.md b/README.md
index fbf944e..b235c74 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@ To run the code, you should do the following:
 2. modify the data path to "your/path/to/data" in fetch_MNIST.py
 3. execute "python LeNet.py"
 
+Note: Python 2.7 is used to execute. Also, if something goes wrong, it is probably because of the incompatible version of numpy.
+
 ## Results
 <p align="center">
   <img src="https://img-blog.csdn.net/20180209154216964?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvU2l0ZTE5OTc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" width="600" title="hover text">