--parent or --trunk is obligatory? av stack reorder

[mchen-codaio]

When running av stack reorder, the documentation says that --parent or --trunk is unnecessary. However, this error happened when I was editing a second branch in a stack without any flags:

error: invalid stack-branch command: --parent=<branch> or --trunk=<branch> must be specified when creating the first branch

It appears to me that the parent is obligatory always and the statement "If parent is not specified, the previous branch in the stack is used (if any)." is not correct.

This is the dialogue that shows up within av stack reorder:

# Commands:
# sb, stack-branch <branch-name> [--parent <parent-branch-name> | --trunk <trunk-branch-name>]
#         Create a new branch as part of a stack. If parent is not specified,
#         the previous branch in the stack is used (if any). If trunk is
#         specified, the branch is rooted from the given branch.
#         trunk-branch-name can be either a branch name or a branch name with a
#         commit ID in the format "<branch-name>@<commit-id>".

[draftcode]

Yes. I think the implementation is not matching with the description. Right now either --parent or --trunk is needed.