diff --git a/Gems/Atom/Feature/Common/Assets/ShaderLib/Atom/Features/PBR/Decals.azsli b/Gems/Atom/Feature/Common/Assets/ShaderLib/Atom/Features/PBR/Decals.azsli
index 1bd8e0b9a5..1d7a2d6dd0 100644
--- a/Gems/Atom/Feature/Common/Assets/ShaderLib/Atom/Features/PBR/Decals.azsli
+++ b/Gems/Atom/Feature/Common/Assets/ShaderLib/Atom/Features/PBR/Decals.azsli
@@ -67,6 +67,9 @@ void ApplyDecal(uint currDecalIndex, inout Surface surface)
         float3 decalSample;
 
         float4 baseMap = 0;
+        
+        // Each texture array handles a size permutation. 
+        // e.g. it could be that tex array 0 handles 256x256 and tex array 1 handles 512x64, etc.
         switch(textureArrayIndex)
         {
             case 0: