diff --git a/proto/ignition/msgs/material.proto b/proto/ignition/msgs/material.proto
index 2f958ac4..a1e99952 100644
--- a/proto/ignition/msgs/material.proto
+++ b/proto/ignition/msgs/material.proto
@@ -124,4 +124,8 @@ message Material
   /// \brief Render order. The higher value will be rendered on top of the
   /// other coplanar polygons
   double render_order    = 11;
+
+  /// \brief If true, the mesh that this material is applied to will be
+  /// rendered as double sided
+  bool double_sided      = 12;
 }