diff --git a/source/_components/light.x10.markdown b/source/_components/light.x10.markdown
index c8a8b8f5277..19e6dbe43cd 100644
--- a/source/_components/light.x10.markdown
+++ b/source/_components/light.x10.markdown
@@ -15,7 +15,7 @@ ha_release: 0.25
 
 The `x10` light platform allows you to control your X10 based lights with Home Assistant.
 
-Requires [Heyu x10 interface](http://www.heyu.org).
+Requires [Heyu x10](http://www.heyu.org) and a CM11A interface; the CM17A "FireCracker" interface is not supported.
 
 To enable those lights, add the following lines to your `configuration.yaml` file: