I just saw that my installed version of git-annex is too old for:

git-annex import --reinject-duplicates [...]

Thus, I downloaded the precompiled binary: git-annex-standalone-amd64.tar.gz 2017-05-10 16:19 54M

First of all, it works fine with this version. However, the "--reinject-duplicates" option is not shown, when calling:

./git-annex help import  ## in ~/git-annex.linux/

So, is the help page just outdated, or does git-annex help gets confused because I still have an older version of git-annex installed in the system?