+=item +L:LABEL
+
+Add the given C<LABEL> to all messages imported, where C<LABEL>
+is an arbitrary user-defined value consisting of lowercase and digits.
+See L<lei-tag(1)> for more info on labels.
+
+For example, specifying C<+L:inbox> applies the C<inbox> label
+to all messages being imported.
+
+May be specified multiple times to apply multiple labels.
+
+Default: none
+
+=item +kw:KEYWORD
+
+Apply C<KEYWORD> to all messages being imported in addition
+to any per-message keywords from the store (unless C<--no-kw>
+is specified). See L<lei-tag(1)> for more info on keywords.
+
+May be specified multiple times to apply multiple keywords.
+
+Default: none
+