diff --git a/README.md b/README.md
index 4fcfbfe..1d94964 100644
--- a/README.md
+++ b/README.md
@@ -155,6 +155,7 @@ Contributions welcome! Read the [contribution guidelines](contributing.md) first
 - [MQTT Explorer](https://mqtt-explorer.com/) - Tool to visualize your MQTT topics in a topic hierarchy, a MQTT swiss-army knife.
 - [MQTT TUI](https://github.com/EdJoPaTo/mqttui) - Simple lightweight terminal based MQTT monitor and publisher.
 - [Python MQTT Client Shell](https://github.com/bapowell/python-mqtt-client-shell) - Text console-based, interactive shell for exercising various tasks associated with MQTT client communications.
+- [RunMQTT MQTT Topic ACL Linter](https://runmqtt.com/mqtt-acl-linter) - Browser-based, local-only validator for MQTT topic-filter ACLs that checks wildcard breadth, tenant boundaries, publish/subscribe direction, placeholders, and overlapping rules. [Source and method](https://github.com/visoar/mqtt-acl-linter).
 - [SimpleMQTT](https://simplemqtt.theoi.de/) - A Slack app to send messages from Slack to MQTT brokers with slash commands.
 - [Wireshark-MQTT](https://github.com/menudoproblema/Wireshark-MQTT) - MQTT dissector for Wireshark.
 - [VSMQTT](https://github.com/rpdswtk/vsmqtt) - Simple MQTT client integrated in Visual Studio Code.