diff --git a/src/host_shaders/metal_copy_to_lut_texture.metal b/src/host_shaders/metal_copy_to_lut_texture.metal
index 1c996516..ef993b64 100644
--- a/src/host_shaders/metal_copy_to_lut_texture.metal
+++ b/src/host_shaders/metal_copy_to_lut_texture.metal
@@ -3,6 +3,7 @@ using namespace metal;
 
 constant ushort lutTextureWidth [[function_constant(0)]];
 
+// The copy is done in a vertex shader instead of a compute kernel, since dispatching compute would require ending the render pass
 vertex void vertexCopyToLutTexture(uint vid [[vertex_id]], texture1d_array<ushort, access::write> out [[texture(0)]], constant ushort* data [[buffer(0)]]) {
     out.write(data[vid], vid % lutTextureWidth, vid / lutTextureWidth);
 }