diff --git a/src/Features/InteriorSunShadows.cpp b/src/Features/InteriorSunShadows.cpp
index ea766f2756..47ef72cce2 100644
--- a/src/Features/InteriorSunShadows.cpp
+++ b/src/Features/InteriorSunShadows.cpp
@@ -1,4 +1,4 @@
-#include "InteriorSunShadows.h"
+#include "InteriorSunShadows.h"
 #include "State.h"
 
 #include <numbers>
@@ -44,11 +44,27 @@ void InteriorSunShadows::EarlyPrepass()
 	isInteriorWithSun = IsInteriorWithSun(globals::game::tes->interiorCell);
 }
 
+/**
+ * @brief Determines if a cell is an interior that supports sun lighting and shadows.
+ *
+ * Returns true if the given cell is non-null and has the flags for interior cell, show sky, use sky lighting, and sunlight shadows all set.
+ *
+ * @param cell Pointer to the cell to check.
+ * @return true if the cell is an interior with sun lighting and shadows enabled; false otherwise.
+ */
 inline bool InteriorSunShadows::IsInteriorWithSun(const RE::TESObjectCELL* cell)
 {
-	return cell && cell->cellFlags.all(RE::TESObjectCELL::Flag::kIsInteriorCell, RE::TESObjectCELL::Flag::kShowSky, RE::TESObjectCELL::Flag::kUseSkyLighting);
+	return cell && cell->cellFlags.all(RE::TESObjectCELL::Flag::kIsInteriorCell, RE::TESObjectCELL::Flag::kShowSky, RE::TESObjectCELL::Flag::kUseSkyLighting, static_cast<RE::TESObjectCELL::Flag>(CellFlagExt::kSunlightShadows));
 }
 
+/**
+ * @brief Returns a dummy TESWorldSpace object based on whether the TES object's interior cell supports sun shadows.
+ *
+ * If the TES object's interior cell exists and qualifies as an interior with sun (per IsInteriorWithSun), returns a special dummy TESWorldSpace to enable sun shadows. Otherwise, returns a dummy TESWorldSpace that disables sun shadows. Falls back to the original GetWorldSpace function if no interior cell is present.
+ *
+ * @param tes The TES object whose world space is being queried.
+ * @return TESWorldSpace* A pointer to the appropriate dummy TESWorldSpace or the result of the original function.
+ */
 RE::TESWorldSpace* InteriorSunShadows::GetWorldSpace::thunk(RE::TES* tes)
 {
 	if (const auto cell = tes->interiorCell)
diff --git a/src/Features/InteriorSunShadows.h b/src/Features/InteriorSunShadows.h
index 9590a6b229..6db935d8bc 100644
--- a/src/Features/InteriorSunShadows.h
+++ b/src/Features/InteriorSunShadows.h
@@ -1,6 +1,12 @@
-#pragma once
+#pragma once
 #include "ShaderCache.h"
 
+/**
+ * @brief Determines if the specified cell is an interior that receives sunlight.
+ *
+ * @param cell Pointer to the cell to check.
+ * @return true if the cell is an interior with sunlight; otherwise, false.
+ */
 struct InteriorSunShadows : Feature
 {
 	static InteriorSunShadows* GetSingleton()
@@ -51,7 +57,14 @@ struct InteriorSunShadows : Feature
 		}
 	}
 
+	static bool IsInteriorWithSun(const RE::TESObjectCELL* cell);
+
 private:
+	enum class CellFlagExt : uint16_t
+	{
+		kSunlightShadows = 1 << 15,
+	};
+
 	float* gShadowDistance = nullptr;
 	uint32_t* rasterStateCullMode = nullptr;
 
@@ -69,8 +82,6 @@ struct InteriorSunShadows : Feature
 
 	void InitialiseOnNewCell(const RE::NiPointer<RE::BSPortalGraph>& portalGraph);
 
-	static bool IsInteriorWithSun(const RE::TESObjectCELL* cell);
-
 	bool IsInSunDirectionAndWithinShadowDistance(const RE::NiPointer<RE::NiAVObject>& object, const RE::NiPoint3& lightDir, const RE::NiPoint3& playerPos) const;
 
 	void PopulateReplacementJobArrays(RE::TESObjectCELL* cell, const RE::NiPointer<RE::BSPortalGraph>& portalGraph, const RE::BSShadowDirectionalLight* dirLight, RE::BSTArray<RE::BSTArray<RE::NiPointer<RE::NiAVObject>>>& jobArrays);
diff --git a/src/Features/VolumetricLighting.cpp b/src/Features/VolumetricLighting.cpp
index 3ca48cc947..8604a84348 100644
--- a/src/Features/VolumetricLighting.cpp
+++ b/src/Features/VolumetricLighting.cpp
@@ -1,5 +1,6 @@
 #include "VolumetricLighting.h"
 
+#include "InteriorSunShadows.h"
 #include "ShaderCache.h"
 #include "State.h"
 
@@ -179,6 +180,11 @@ void VolumetricLighting::PostPostLoad()
 	defaultSizeHigh = *gVolumetricLightingSizeHigh;
 }
 
+/**
+ * @brief Updates volumetric lighting state based on the player's current location.
+ *
+ * Detects whether the player has entered or exited an interior cell and whether the interior supports sun shadows. Applies appropriate volumetric lighting settings if the state has changed.
+ */
 void VolumetricLighting::EarlyPrepass()
 {
 	const auto interiorCell = globals::game::tes->interiorCell;
@@ -189,7 +195,7 @@ void VolumetricLighting::EarlyPrepass()
 
 	initialised = true;
 	inInterior = currentlyInInterior;
-	inInteriorWithSunShadows = interiorCell && interiorCell->cellFlags.all(RE::TESObjectCELL::Flag::kIsInteriorCell, RE::TESObjectCELL::Flag::kShowSky, RE::TESObjectCELL::Flag::kUseSkyLighting);
+	inInteriorWithSunShadows = InteriorSunShadows::IsInteriorWithSun(interiorCell);
 	SetupVL();
 }