diff --git a/README.md b/README.md
index 73830156..6f7669be 100644
--- a/README.md
+++ b/README.md
@@ -196,6 +196,7 @@ Table of Contents
   * https://www.librato.com/ - Free up to 100 metrics at 60s resolution
   * https://freeboard.io/ - Free for public projects.  Dashboards for your Internet of Things projects.
   * https://loader.io/ - Free load testing tools with limitations.
+  * http://www.probeapi.com/ - Performance Monitoring API, checks ping, dns etc
 
 ## Crash / Exception handling