diff --git a/README.md b/README.md
index f0e78b4..ddc17b5 100644
--- a/README.md
+++ b/README.md
@@ -6,4 +6,4 @@ Monitoring Thresholding Engine
 Computes thresholds on metrics and publishes alarms to the MessageQ when exceeded.
 Based on Apache Storm a free and open distributed real-time computation system.
 
-![Threshold Engine Architecture](mon-thresh-architecture.jpg "Threshold Engine Architecture")
+![Threshold Engine Architecture](mon-thresh-architecture.png "Threshold Engine Architecture")