from stgit import stack, git
-help = 'initialise the tree for use with StGIT'
-usage = '%prog'
+help = 'initialise the current branch for use with StGIT'
+usage = """%prog [options]
+Initialise the current GIT branch to be used as an StGIT stack. Note
+that you must already be in a GIT repository and .git/HEAD must point
+to a valid file in refs/heads/."""
+
+directory = DirectoryHasRepository()
options = []