docs: for PR #5112

ACKNOWLEDGEMENTS.md

@@ -810,3 +810,4 @@ Further device support has been made with the assistance of users. Please consid
 - [maxios777](https://github.com/maxios777) for contributing support for WetAir WAD-A10L dehumidifier.
 - [dvismans](https://github.com/dvismans) for contributing support for ET F32 thermostat.
 - [InfObject](https://github.com/InfObject) for contributing support for Feyree Lion EV-Ultra charger.
+- [DEFALTUSER-24](https://github.com/DEFALTUSER-24) for contributing support for Gadnic AC800 robot vacuum.

DEVICES.md

@@ -1004,6 +1004,7 @@ of device.
 - Abir X8 vacuum cleaner
 - Airrobo P20 vacuum cleaner
 - Cecotec Conga 1970, X70, Z100 vacuum cleaners
+- Gadnic AC800 mopping vacuum cleaner
 - Horniture G20, Q6 Pro vacuum cleaners
 - iHome Autoac Nova vacuum cleaner
 - ILIFE A12, A30 pro, V20, V30 vacuum cleaners