diff --git a/README.md b/README.md
index 8ff828f..10966a1 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 `jwtpxy` simplifies API security by pre-validating and parsing JWT web tokens into HTTP headers easily read by backend services.
 
-![jwtpxy diagram](diag.png)
+![jwtpxy diagram](diag.jpg)
 
 ## Environment Variable Configuration