docs: for PR #5201

ACKNOWLEDGEMENTS.md

@@ -827,3 +827,4 @@ Further device support has been made with the assistance of users. Please consid
 - [cmoates](https://github.com/cmoates) for contributing support for Comfort Zone tower fan.
 - [dhomeed](https://github.com/dhomeed) for contributing support for Alpine Saunas Helsinki sauna controller.
 - [slickm0nty](https://github.com/slickm0nty) for contributing support for NBQ100-US solar microinverter.
+- [wangwillian0](https://github.com/wangwillian0) for contributing support for Abir X9 vacuum.

DEVICES.md

@@ -1011,7 +1011,7 @@ of device.
 
 ### Robot vacuums
 
-- Abir X8 vacuum cleaner
+- Abir X8 and X9 vacuum cleaners
 - Airrobo P20 vacuum cleaner
 - Cecotec Conga 1970, X70, Z100 vacuum cleaners
 - Gadnic AC800 mopping vacuum cleaner