+tg depend
+~~~~~~~~~
+ Change dependencies of a TopGit-controlled topic branch.
+ This should have several subcommands, but only 'add' is
+ supported right now.
+
+ The 'add' subcommand takes an argument of a topic branch
+ to be added, adds it to '.topdeps', performs a commit and
+ then updates your topic branch accordingly. If you want to
+ do other things related to the dependency addition, like
+ adjusting '.topmsg', prepare them in the index before
+ calling 'tg depend add'.
+
+ TODO: Subcommand for removing dependencies, obviously
+