diff --git a/readme.md b/readme.md
index a877d315efa680ec7a653b7493b9910d20b0f81e..19845d43d214dccda33253131b41990de657e0c0 100644
--- a/readme.md
+++ b/readme.md
@@ -9,7 +9,7 @@ Simulates a vacuum cleaner AI attempting to clean up a virtual room.
 
 
 ## Languages
-Written using Python3.9. Tested in Ubuntu20.
+Written using Python3.9. Tested in Ubuntu18 and Ubuntu20.
 
 
 ## Installation