diff --git a/proto/ignition/msgs/scene.proto b/proto/ignition/msgs/scene.proto
index da514af0..97bf292e 100644
--- a/proto/ignition/msgs/scene.proto
+++ b/proto/ignition/msgs/scene.proto
@@ -29,6 +29,7 @@ import "ignition/msgs/fog.proto";
 import "ignition/msgs/sky.proto";
 import "ignition/msgs/light.proto";
 import "ignition/msgs/joint.proto";
+import "ignition/msgs/material.proto";
 import "ignition/msgs/model.proto";
 import "ignition/msgs/header.proto";
 
@@ -51,4 +52,7 @@ message Scene
 
   /// \brief Show/hide world origin indicator.
   bool origin_visual  = 12;
+
+  /// \brief Shadow caster material script.
+  Material.Script shadow_caster_material_script = 13;
 }