diff --git a/examples/customization/custom-vts-metrics-prometheus/README.md b/examples/customization/custom-vts-metrics-prometheus/README.md
index 388617b158..abdfcbded6 100644
--- a/examples/customization/custom-vts-metrics-prometheus/README.md
+++ b/examples/customization/custom-vts-metrics-prometheus/README.md
@@ -1,6 +1,6 @@
 # Deploying the Nginx Ingress controller
 
-This example aims to demonstrate the deployment of an nginx ingress controller and use a ConfigMap to enable [nginx vts module](github.com/vozlt/nginx-module-vts
+This example aims to demonstrate the deployment of an nginx ingress controller and use a ConfigMap to enable [nginx vts module](https://github.com/vozlt/nginx-module-vts
 ) to export metrics in prometheus format. 
 
 # vts-metrics