diff --git a/gui/event_router.cpp b/gui/event_router.cpp
index b2afd32..855125f 100644
--- a/gui/event_router.cpp
+++ b/gui/event_router.cpp
@@ -121,7 +121,6 @@ namespace gui {
       }
     }
 
-
     void Router::MOUSE_DRAGGING(Event ev) {
       switch(ev) {
         case MOUSE_UP:
@@ -136,6 +135,7 @@ namespace gui {
           set_event(game::Event::KEY_PRESS);
           break;
         default:
+          // invalid events: 1
           dbc::sentinel(fmt::format("invalid events: {}", int(ev)));
       }
     }