diff --git a/README.md b/README.md
index 5d1ca3f..fb819a0 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@ returns the result to you as a Ruby object.
 
 ExecJS supports these runtimes:
 
+* [Mustang](https://github.com/nu7hatch/mustang) - Mustang V8
+  embedded within Ruby
 * [therubyracer](https://github.com/cowboyd/therubyracer) - Google V8
   embedded within MRI Ruby
 * [therubyrhino](https://github.com/cowboyd/therubyrhino) - Mozilla