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ScriptableRenderPipeline/Core/ShaderLibrary/CommonLighting.hlsl

 }
 
 // Ref: Moving Frostbite to PBR - Gotanda siggraph 2011
-float GetSpecularOcclusion(float NdotV, float ambientOcclusion, float roughness)
+// Return specular occlusion based on ambient occlusion (usually get from SSAO) and view/roughness info
+float SpecularOcclusionFromAmbientOcclusion(float NdotV, float ambientOcclusion, float roughness)
+// Update ambient occlusion to colored ambient occlusion based on statitics of how light is bouncing in an object and with the albedo of the object
 float3 GTAOMultiBounce(float visibility, float3 albedo)
 {
     float3 a =  2.0404 * albedo - 0.3324;

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

     // Add indirect diffuse + emissive (if any) - Ambient occlusion is multiply by emissive which is wrong but not a big deal
     bakeDiffuseLighting *= GTAOMultiBounce(lightLoopContext.indirectAmbientOcclusion, bsdfData.diffuseColor);
 
-    float specularOcclusion = GetSpecularOcclusion(preLightData.NdotV, lightLoopContext.indirectAmbientOcclusion, bsdfData.roughness);
+    float specularOcclusion = GetSpecularOcclusionFromAmbientOcclusion(preLightData.NdotV, lightLoopContext.indirectAmbientOcclusion, bsdfData.roughness);
     // Try to mimic multibounce with specular color. Not the point of the original formula but ok result.
     accLighting.envSpecularLighting *= bsdfData.specularOcclusion * GTAOMultiBounce(specularOcclusion, bsdfData.fresnel0);