zsh completion and unknow bzr commands

ZSH's Bazaar completion does not offer any expansion/completion when it does not know the bzr subcommand I am using. In my case, I use bzr qlog but ZSH's /usr/share/zsh/5.0.2/functions/_bzr does not know about this command. As far as I can tell it ends up returning nothing from completion function: (*) _message "unknown bzr command completion: $cmd" return 1 ;; At this point I have employed a hack like this to make it complete with file names: (*) _message "unknown bzr command completion: $cmd" args+=( '*:FILE:_files' ) #return 1 ;; Is there any better way how to do this?