Go version

latest

Output of go env in your module/workspace:

N/A

What did you do?

go help tool

What did you see happen?

No mention of -modfile

What did you expect to see?

Available flags are documented. Given the issues around default modfile sharing with the tools and the main project, using alternative mod files is likely to be very common. Documenting the flags available will ensure users do not reach to weird workarounds rather than just do -modfile=tools/go.mod or similar.