-This is identical to the C<spam> command above, but does
-not feed the message to L<spamc(1)>
+This is similar to the C<spam> command above, but does
+not feed the message to L<spamc(1)> and only removes messages
+which match on any of the C<To:>, C<Cc:>, and C<List-ID:> headers.
+
+The C<--all> option may be used match C<spam> semantics in removing
+the message from all configured inboxes. C<--all> is only
+available in public-inbox 1.6.0+.