diff --git a/components/renderers/cpp/src/splatter.cu b/components/renderers/cpp/src/splatter.cu
index de3902b6c2471099f6aeca47d99d680e825aa288..6f94b7636d4367ae4b465ad58e16163264c3a361 100644
--- a/components/renderers/cpp/src/splatter.cu
+++ b/components/renderers/cpp/src/splatter.cu
@@ -104,7 +104,7 @@ __global__ void dibr_attribute_contrib_kernel(
     //if (abs(d - camPos.z) > DEPTH_THRESHOLD) return;
 
 	const float4 colour = (params.m_flags & ftl::render::kShowDisconMask && worldPos.w < 0.0f) ?
-			make_float4(0.0f,0.0f,255.0f,255.0f) :
+			make_float4(0.0f,0.0f,255.0f,255.0f) :  // Show discontinuity mask in red
 			make_float4(colour_in.tex2D(x, y));
     //const float4 normal = tex2D<float4>(camera.normal, x, y);