<refspec>::
The canonical format of a <refspec> parameter is
- +?<src>:<dst>; that is, an optional plus '+', followed
+ '+?<src>:<dst>'; that is, an optional plus '+', followed
by the source ref, followed by a colon ':', followed by
the destination ref.
<ref>: when pulling/fetching, and <ref>:<ref> when
pushing. That is, do not store it locally if
fetching, and update the same name if pushing.
+
+-a, \--append::
+ Append ref names and object names of fetched refs to the
+ existing contents of $GIT_DIR/FETCH_HEAD. Without this
+ option old data in $GIT_DIR/FETCH_HEAD will be overwritten.
+
+-f, \--force::
+ Usually, the command refuses to update a local ref that is
+ not an ancestor of the remote ref used to overwrite it.
+ This flag disables the check. What this means is that the
+ local repository can lose commits; use it with care.