diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 4c56b8eace2da1c8367fb92565f19ecbd3403e2c..7560fe95054736d30d08fd15e8205dc1d1aba736 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -2703,6 +2703,7 @@ LLGLSPipelineBlendSkyBox::LLGLSPipelineBlendSkyBox(bool depth_test, bool depth_w
 
 #if LL_WINDOWS
 // Expose desired use of high-performance graphics processor to Optimus driver
+// https://docs.nvidia.com/gameworks/content/technologies/desktop/optimus.htm
 extern "C" 
 { 
     _declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;