add comment

com.unity.render-pipelines.high-definition/HDRP/Lighting/ScreenSpaceLighting/ShaderVariablesScreenSpaceLighting.hlsl

     // Ambiant occlusion
     float4 _AmbientOcclusionParam; // xyz occlusion color, w directLightStrenght
     
-    float4 _IndirectLightingMultiplier;
+    float4 _IndirectLightingMultiplier; // .x indirect diffuse multiplier (use with indirect lighting volume controler)
     
 #else
     // Rough refraction texture