What is the format of FILE as in --exclude-file=FILE?
Is it perhaps of the form "file:line"? If so, I suggest fixing the help message from:
-x FILE, --exclude-file=FILE
FILE with lines that should not be changed
to:
-x FILE, --exclude-file=FILE
FILE with file:line pairs that should not be changed
That would avoid misunderstandings such as #1601 (comment) and codespell-project/actions-codespell#33 (comment).