I have a git repo in ~/.janus/ with a bunch of submodules in it. I want to add a submodule in ~/.janus/snipmate-snippets/snippets/, but when I run git submodule add <git@github.com:...> in the snipmate-snippets directory, I get the following error message:
You need to run this command from the toplevel of the working tree.
So the question is: How do I add a submodule to the snipmate-snippets directory?