diff --git a/3-mid/opengl/source/lean/geometry/opengl-geometry-lit_colored_textured.ads b/3-mid/opengl/source/lean/geometry/opengl-geometry-lit_colored_textured.ads
index d36cc4f..24f1b50 100644
--- a/3-mid/opengl/source/lean/geometry/opengl-geometry-lit_colored_textured.ads
+++ b/3-mid/opengl/source/lean/geometry/opengl-geometry-lit_colored_textured.ads
@@ -27,7 +27,7 @@ is
          Normal : Vector_3;
          Color  : rgba_Color;
          Coords : Coordinate_2D;
-         Shine  : Real;
+         Shine  : Real;                    -- TODO: Use 'openGL.Shine' type.
       end record;
 
    type Vertex_array is array (Index_t range <>) of aliased Vertex;