Without '--force', the <src> ref is stored at the remote only if
<dst> does not exist, or <dst> is a proper subset (i.e. an
-ancestor) of <src>. This check, known as "fast forward check",
+ancestor) of <src>. This check, known as "fast-forward check",
is performed in order to avoid accidentally overwriting the
remote ref and lose other peoples' commits from there.
-With '--force', the fast forward check is disabled for all refs.
+With '--force', the fast-forward check is disabled for all refs.
Optionally, a <ref> parameter can be prefixed with a plus '+' sign
to disable the fast-forward check only on that ref.