SYNOPSIS
--------
[verse]
-'git subtree' add -P <prefix> <commit>
+'git subtree' add -P <prefix> <refspec>
+'git subtree' add -P <prefix> <repository> <refspec>
'git subtree' pull -P <prefix> <repository> <refspec...>
'git subtree' push -P <prefix> <repository> <refspec...>
'git subtree' merge -P <prefix> <commit>