Documentation / git-remote-helpers.txtoon commit howto/using-merge-subtree: mention --allow-unrelated-histories (5e495f8)
   1git-remote-helpers
   2==================
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   4This document has been moved to linkgit:gitremote-helpers[1].
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   6Please let the owners of the referring site know so that they can update the
   7link you clicked to get here.
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   9Thanks.