+.TP
+.BI --existing-package= package
+dgit push needs to canonicalise the suite name. But currently
+there is no way to ask the archive to do this without knowing the
+name of an existing package. Without --new we can just use the
+package we are trying to push. But with --new that will not work, so
+we guess that
+.B dpkg
+exists in the target suite. If it doesn't, you can use this option to
+specify a package which does. If the suite is empty, bad luck.