Improve grammar in README.md
@@ -21,7 +21,7 @@ python validate_submission.py \
After run this tool will print whether submission is valid or not.
If submission is invalid then log messages will contain explanation why.
-NOTE: This tool might not work properly if file is located on NFS or if
-directory containing submission file can't be mounted in Docker using `-v`
+NOTE: This tool might not work properly if the file is located on NFS or if
+the directory containing submission file can't be mounted in Docker using `-v`
command line argument. In such case copy file to different location and try
again.
