diff --git a/readme.md b/readme.md
index 4f40cdb3..1418ae30 100644
--- a/readme.md
+++ b/readme.md
@@ -43,6 +43,10 @@ Tests are located in the `test/` folder. Load `test/test.html` in your browser o
 
 Robot works with a variety of UI libraries, and includes integrations for React, Preact, Haunted, and more. See the [integrations page](https://thisrobot.life/integrations.html) to learn more.
 
+## Tools
+
+* Visualization of robot state machines: [robot3-viz](https://github.com/jbreckmckye/robot3-viz)
+
 ## License
 
-BSD-2-Clause
\ No newline at end of file
+BSD-2-Clause