The deployment documentation at http://immutant.org/documentation/current/deployment.html makes no mention of the --include-dependencies flag to 'lein immutant archive'.
So this option is in fact documented in the lein plugin README, which is pointed to in the main documentation. Perhaps just a parenthetical listing of those options attached to that link is sufficient.
I agree that the link to the README is enough - closing.
On re-reading the docs, I think we do need to mention something about the dependencies not being included by default. I'll do that now.