diff --git a/proto/ignition/msgs/marker.proto b/proto/ignition/msgs/marker.proto
index 8930cb6d..d1468f04 100644
--- a/proto/ignition/msgs/marker.proto
+++ b/proto/ignition/msgs/marker.proto
@@ -46,6 +46,7 @@ message Marker
     TRIANGLE_FAN   = 8;
     TRIANGLE_LIST  = 9;
     TRIANGLE_STRIP = 10;
+    CONE           = 11;
   }
 
   /// \brief Visilibity defines what cameras render the marker.