diff --git a/libraries/render-utils/src/StencilMaskPass.cpp b/libraries/render-utils/src/StencilMaskPass.cpp
index f9305d8268..79833795e9 100644
--- a/libraries/render-utils/src/StencilMaskPass.cpp
+++ b/libraries/render-utils/src/StencilMaskPass.cpp
@@ -128,6 +128,7 @@ void PrepareStencil::testNoAA(gpu::State& state) {
         gpu::State::STENCIL_OP_KEEP, gpu::State::STENCIL_OP_KEEP, gpu::State::STENCIL_OP_KEEP));
 }
 
+// Pass if this area has been marked as MASK or NO_AA
 void PrepareStencil::testMaskNoAA(gpu::State& state) {
     state.setStencilTest(true, 0x00, gpu::State::StencilTest(0, STENCIL_MASK | STENCIL_NO_AA, gpu::EQUAL,
         gpu::State::STENCIL_OP_KEEP, gpu::State::STENCIL_OP_KEEP, gpu::State::STENCIL_OP_KEEP));