diff --git a/README.md b/README.md
index d5f27c42..d45d124f 100644
--- a/README.md
+++ b/README.md
@@ -323,6 +323,7 @@ Table of Contents
   * [nodequery.com](https://nodequery.com/) — Free basic server monitor up to 10 servers
   * [circonus.com](https://www.circonus.com/) — Free for 20 metrics
   * [uptimerobot.com](https://uptimerobot.com/) — Website monitoring, 50 monitors free
+  * [sitemonki.com](https://sitemonki.com/) — Website, domain, Cron & SSL monitoring, 5 monitors in each category for free
   * [statuscake.com](https://www.statuscake.com/) — Website monitoring, unlimited tests free with limitations
   * [bmc.com](https://www.bmc.com/truesightpulse/) — Free 1 second resolution for up to 10 servers
   * [ghostinspector.com](https://ghostinspector.com/) — Free website and web application monitoring. Single user, 100 test runs/month