-has a reflog then the reflog will also be deleted. Use -r together with -d
-to delete remote-tracking branches.
+has a reflog then the reflog will also be deleted.
+
+Use -r together with -d to delete remote-tracking branches. Note, that it
+only makes sense to delete remote-tracking branches if they no longer exist
+in remote repository or if gitlink:git-fetch[1] was configured not to fetch
+them again. See also 'prune' subcommand of gitlink:git-remote[1] for way to
+clean up all obsolete remote-tracking branches.