diff --git a/docs/en/dev/stateroles.md b/docs/en/dev/stateroles.md
index c50fd0356..e8671ce01 100644
--- a/docs/en/dev/stateroles.md
+++ b/docs/en/dev/stateroles.md
@@ -26,6 +26,7 @@ in the [Type-detector repository](https://github.com/ioBroker/ioBroker.type-dete
 ## Sensor (booleans, read-only)
 `common.type=boolean, common.write=false`
 
+* `sensor.contact`        - general contact, closed -`true` or open - `false`
 * `sensor.window`         - window opened-`true` or closed-`false`
 * `sensor.door`           - door opened-`true` or closed-`false`
 * `sensor.alarm`          - some common alarm