diff --git a/data/uking_functions.csv b/data/uking_functions.csv
index 830151ea..6c8b6c80 100644
--- a/data/uking_functions.csv
+++ b/data/uking_functions.csv
@@ -83008,8 +83008,8 @@ Address,Quality,Size,Name
 0x0000007100f8f1c4,O,000572,_ZN4ksys4phys9RigidBody22setCollisionFilterInfoEj
 0x0000007100f8f400,O,000172,_ZN4ksys4phys9RigidBody20enableWaterCollisionEb
 0x0000007100f8f4ac,O,000048,_ZNK4ksys4phys9RigidBody23isWaterCollisionEnabledEv
-0x0000007100f8f4dc,O,000064,_ZN4ksys4phys9RigidBody23setSensorReceiverLayer2ENS0_12ContactLayerE
-0x0000007100f8f51c,O,000104,_ZN4ksys4phys9RigidBody25clearSensorReceiverLayer2Ev
+0x0000007100f8f4dc,O,000064,_ZN4ksys4phys9RigidBody29setSensorReceiverIgnoredLayerENS0_12ContactLayerE
+0x0000007100f8f51c,O,000104,_ZN4ksys4phys9RigidBody31clearSensorReceiverIgnoredLayerEv
 0x0000007100f8f584,O,000144,_ZN4ksys4phys9RigidBody25setContactLayerAndHandlerENS0_12ContactLayerEPNS0_18SystemGroupHandlerE
 0x0000007100f8f614,O,000144,_ZN4ksys4phys9RigidBody15setContactLayerENS0_12ContactLayerE
 0x0000007100f8f6a4,O,000256,_ZN4ksys4phys9RigidBody21setSystemGroupHandlerEPNS0_18SystemGroupHandlerE
@@ -84143,7 +84143,7 @@ Address,Quality,Size,Name
 0x0000007100fc8374,O,000192,_ZN4ksys4phys17SensorGroupFilter30doInitSystemGroupHandlerLists_EPN4sead4HeapE
 0x0000007100fc8434,O,000016,_ZN4ksys4phys17SensorGroupFilter16getFreeListIndexEPKNS0_18SystemGroupHandlerE
 0x0000007100fc8444,O,000072,_ZN4ksys4phys27sensorCollisionMaskSetLayerENS0_12ContactLayerEj
-0x0000007100fc848c,O,000060,_ZN4ksys4phys28sensorCollisionMaskSetLayer2EbNS0_12ContactLayerEj
+0x0000007100fc848c,O,000060,_ZN4ksys4phys34sensorCollisionMaskSetIgnoredLayerEbNS0_12ContactLayerEj
 0x0000007100fc84c8,O,000056,_ZN4ksys4phys24SensorSystemGroupHandler23makeCollisionFilterInfoEjNS0_12ContactLayerENS0_9GroundHitE
 0x0000007100fc8500,O,000020,_ZN4ksys4phys24SensorSystemGroupHandler22makeQueryCollisionMaskEjNS0_9GroundHitEb
 0x0000007100fc8514,O,000020,_ZN4ksys4phys24SensorSystemGroupHandler2m8Ev
diff --git a/src/KingSystem/Physics/RigidBody/physRigidBody.cpp b/src/KingSystem/Physics/RigidBody/physRigidBody.cpp
index c9418fcb..41dbebe0 100644
--- a/src/KingSystem/Physics/RigidBody/physRigidBody.cpp
+++ b/src/KingSystem/Physics/RigidBody/physRigidBody.cpp
@@ -717,14 +717,14 @@ void RigidBody::setCollisionFilterInfo(u32 info) {
     }
 }
 
-void RigidBody::setSensorReceiverLayer2(ContactLayer layer) {
+void RigidBody::setSensorReceiverIgnoredLayer(ContactLayer layer) {
     static_cast<void>(isSensor());
     static_cast<void>(isSensor());
-    const auto info = sensorCollisionMaskSetLayer2(true, layer, getCollisionFilterInfo());
+    const auto info = sensorCollisionMaskSetIgnoredLayer(true, layer, getCollisionFilterInfo());
     setCollisionFilterInfo(info);
 }
 
-void RigidBody::clearSensorReceiverLayer2() {
+void RigidBody::clearSensorReceiverIgnoredLayer() {
     if (!isSensor())
         return;
 
@@ -732,8 +732,8 @@ void RigidBody::clearSensorReceiverLayer2() {
         return;
 
     // The layer we pass here is actually irrelevant because we're clearing the layer value anyway.
-    const auto info =
-        sensorCollisionMaskSetLayer2(false, ContactLayer::SensorNoHit, getCollisionFilterInfo());
+    const auto info = sensorCollisionMaskSetIgnoredLayer(false, ContactLayer::SensorNoHit,
+                                                         getCollisionFilterInfo());
 
     setCollisionFilterInfo(info);
 }
diff --git a/src/KingSystem/Physics/RigidBody/physRigidBody.h b/src/KingSystem/Physics/RigidBody/physRigidBody.h
index d015f267..b98ba414 100644
--- a/src/KingSystem/Physics/RigidBody/physRigidBody.h
+++ b/src/KingSystem/Physics/RigidBody/physRigidBody.h
@@ -229,10 +229,9 @@ public:
     }
 
     /// Only works for sensor rigid bodies that do not use a custom receiver.
-    // TODO: rename once we figure out what this layer is used for
-    void setSensorReceiverLayer2(ContactLayer layer);
+    void setSensorReceiverIgnoredLayer(ContactLayer layer);
     /// Only works for sensor rigid bodies that do not use a custom receiver.
-    void clearSensorReceiverLayer2();
+    void clearSensorReceiverIgnoredLayer();
 
     void setContactLayerAndHandler(ContactLayer layer, SystemGroupHandler* handler);
     void setContactLayerAndGroundHit(ContactLayer layer, GroundHit ground_hit);
diff --git a/src/KingSystem/Physics/System/physInstanceSet.cpp b/src/KingSystem/Physics/System/physInstanceSet.cpp
index 2d7d4dd5..ccfc3062 100644
--- a/src/KingSystem/Physics/System/physInstanceSet.cpp
+++ b/src/KingSystem/Physics/System/physInstanceSet.cpp
@@ -140,7 +140,7 @@ void InstanceSet::sub_7100FBB00C(phys::RigidBody* body, phys::RigidBodyParam* pa
     }
     body->enableGroundCollision(instance_params.no_hit_ground == 0);
     body->enableWaterCollision(instance_params.no_hit_water == 0);
-    body->clearSensorReceiverLayer2();
+    body->clearSensorReceiverIgnoredLayer();
 }
 
 void* InstanceSet::sub_7100FBBC28(const sead::SafeString& name) const {
diff --git a/src/KingSystem/Physics/System/physSensorGroupFilter.cpp b/src/KingSystem/Physics/System/physSensorGroupFilter.cpp
index 5d339276..9c5ed54d 100644
--- a/src/KingSystem/Physics/System/physSensorGroupFilter.cpp
+++ b/src/KingSystem/Physics/System/physSensorGroupFilter.cpp
@@ -82,9 +82,9 @@ hkBool SensorGroupFilter::testCollisionForSensors(u32 infoA, u32 infoB) const {
             return false;
         }
 
-        if (a.data.has_layer2 && b.data.layer == a.data.layer2)
+        if (a.data.has_ignored_layer && b.data.layer == a.data.ignored_layer)
             return false;
-        if (b.data.has_layer2 && a.data.layer == b.data.layer2)
+        if (b.data.has_ignored_layer && a.data.layer == b.data.ignored_layer)
             return false;
 
         return m_collisionLookupTable[a.data.layer] & (1 << b.data.layer);
@@ -241,7 +241,7 @@ u32 sensorCollisionMaskSetLayer(ContactLayer layer, u32 mask) {
             clearBitFields(&info.raw, info.is_custom_receiver, info.custom_receiver_data.layer);
         } else {
             clearBitFields(&info.raw, info.is_custom_receiver, info.data.layer,
-                           info.data.has_layer2, info.data.layer2);
+                           info.data.has_ignored_layer, info.data.ignored_layer);
         }
 
         if (info.is_custom_receiver) {
@@ -254,7 +254,7 @@ u32 sensorCollisionMaskSetLayer(ContactLayer layer, u32 mask) {
     return info.raw;
 }
 
-u32 sensorCollisionMaskSetLayer2(bool set, ContactLayer layer, u32 mask) {
+u32 sensorCollisionMaskSetIgnoredLayer(bool set, ContactLayer layer, u32 mask) {
     SEAD_ASSERT(getContactLayerType(layer) == ContactLayerType::Sensor);
 
     SensorCollisionMask info{mask};
@@ -262,12 +262,12 @@ u32 sensorCollisionMaskSetLayer2(bool set, ContactLayer layer, u32 mask) {
         return info.raw;
 
     info.is_custom_receiver = false;
-    info.data.has_layer2 = false;
-    info.data.layer2 = {};
+    info.data.has_ignored_layer = false;
+    info.data.ignored_layer = {};
 
     if (set) {
-        info.data.has_layer2 = true;
-        info.data.layer2.SetUnsafe(layer - FirstSensor);
+        info.data.has_ignored_layer = true;
+        info.data.ignored_layer.SetUnsafe(layer - FirstSensor);
     }
 
     return info.raw;
diff --git a/src/KingSystem/Physics/System/physSensorGroupFilter.h b/src/KingSystem/Physics/System/physSensorGroupFilter.h
index 4f85702d..c3e942dc 100644
--- a/src/KingSystem/Physics/System/physSensorGroupFilter.h
+++ b/src/KingSystem/Physics/System/physSensorGroupFilter.h
@@ -64,13 +64,12 @@ protected:
 /// @param mask An existing sensor collision mask
 u32 sensorCollisionMaskSetLayer(ContactLayer layer, u32 mask);
 
-/// Set or clear a second contact layer in a sensor collision mask.
+/// Set or clear a contact layer to ignore during collision detection in a sensor collision mask.
 /// This function does nothing when using a custom receiver.
 /// @param set If true, set the specified layer. Clear it otherwise
-/// @param layer A sensor contact layer
+/// @param layer A sensor contact layer to be ignored
 /// @param mask An existing sensor collision mask
-// TODO: rename once we figure out what this layer is used for
-u32 sensorCollisionMaskSetLayer2(bool set, ContactLayer layer, u32 mask);
+u32 sensorCollisionMaskSetIgnoredLayer(bool set, ContactLayer layer, u32 mask);
 
 inline u32 SensorSystemGroupHandler::makeCollisionFilterInfo(u32 info, ContactLayer layer,
                                                              GroundHit ground_hit) {
diff --git a/src/KingSystem/Physics/physDefines.h b/src/KingSystem/Physics/physDefines.h
index 55718aaa..befc5ae7 100644
--- a/src/KingSystem/Physics/physDefines.h
+++ b/src/KingSystem/Physics/physDefines.h
@@ -308,11 +308,14 @@ union SensorCollisionMask {
     union Data {
         ContactLayer getLayer() const { return int(layer) + FirstSensor; }
 
-        /// ContactLayer minus FirstSensor.
+        /// The sensor's contact layer.
+        /// @note Add FirstSensor to get the actual ContactLayer value.
         util::BitField<0, 5, u32> layer;
-        // TODO: rename once we figure out what this layer is used for
-        util::BitField<5, 1, bool, u32> has_layer2;
-        util::BitField<6, 5, u32> layer2;
+        /// Whether `ignored_layer` contains a valid layer.
+        util::BitField<5, 1, bool, u32> has_ignored_layer;
+        /// Contact layer to ignore during collision detection. Only valid if `has_ignored_layer`.
+        /// @note Add FirstSensor to get the actual ContactLayer value.
+        util::BitField<6, 5, u32> ignored_layer;
     };
 
     union CustomReceiverData {