- Do not generate a merge commit if the merge resolved as
- a fast-forward, only update the branch pointer. This is
- the default behavior of git-merge.
-+
-With --no-ff Generate a merge commit even if the merge
-resolved as a fast-forward.
+ Create a merge commit even when the merge resolves as a
+ fast-forward.
+
+--ff-only::
+ Refuse to merge and exit with a non-zero status unless the
+ current `HEAD` is already up-to-date or the merge can be
+ resolved as a fast-forward.