Update README.md

Co-authored-by: carriecwk <[email protected]>

Author: lantoli

README.md

@@ -28,7 +28,7 @@ you can also use shorter aliases, e.g.:
 atlas tf clu2adv -f in.tf -o out.tf
 ```
 
-If you want to overwrite the output file if it exists, or even use the same output file as the input file, use `--overwriteOutput true` or `-w` flag.
+If you want to overwrite the output file if it exists, or even use the same output file as the input file, use the `--overwriteOutput true` or the `-w` flag.
 
 
 ## Contributing