osmrel2gpx: documented bugs and limitations

Author: eserte

miscsrc/osmrel2gpx

@@ -252,3 +252,12 @@ if ($output) {
 } else {
     print $gpx;
 }
+
+=head1 BUGS AND LIMITATIONS
+
+Theoretically it would be possible to determine the route direction
+automatically if C<--start> and C<--end> are both specified. This is
+not implemented, so it's necessary to manually specify C<--backward>
+if needed.
+
+=cut