diff --git a/booking.rooms_admin.inc b/booking.rooms_admin.inc
index 725e247..61a8a72 100644
--- a/booking.rooms_admin.inc
+++ b/booking.rooms_admin.inc
@@ -434,6 +434,7 @@ function booking_rooms_definition_form_validate($form, $form_state) {
 
 	if (! is_numeric($values['booking_room_number'])) {
 		form_set_error('booking_room_number', t('Room number must be numeric. If you need to use a more descriptive label, please use the room label field.'));
+		watchdog('booking_debug', "<pre>Room definition submission:\n@info</pre>", array('@info' => print_r( $form_state, true)));
 	}
 }