docs: for PR #3543

ACKNOWLEDGEMENTS.md

@@ -1009,4 +1009,4 @@ Further device support has been made with the assistance of users. Please consid
 - [rimmiaciej](https://github.com/rimmiaciej) for contributing support for Klarta Forste 4 air purifier.
 - [dmostert](https://github.com/dmostert) for contributing improvements to ITS 45HD heat pump.
 - [infestonn](https://github.com/infestonn) for contributing support for Aeno EK1S kettle.
-- [stepsolar](https://github.com/stepsolar) for contributing improvements to KW02 video doorbell.
+- [stepsolar](https://github.com/stepsolar) for contributing improvements to KW02 video doorbell and support for RCU16 relay module.

DEVICES.md

@@ -596,6 +596,7 @@ the best option.
 - Novadigital 4-way switch with backlight, power on state and timers
 - Qnect QN-WPO3 3 outlet + USB powerstrip with individual timers
 - Relay switch with 433MHz remote (unbranded)
+- RCU16 16ch relay module
 - Single switch with backlight (unbranded)
 - Somgam single wall switch
 - Somgam double wall switch