diff --git a/invokeai/frontend/web/src/features/regionalPrompts/hooks/mouseEventHooks.ts b/invokeai/frontend/web/src/features/regionalPrompts/hooks/mouseEventHooks.ts
index d926233522..f511656a67 100644
--- a/invokeai/frontend/web/src/features/regionalPrompts/hooks/mouseEventHooks.ts
+++ b/invokeai/frontend/web/src/features/regionalPrompts/hooks/mouseEventHooks.ts
@@ -5,8 +5,8 @@ import {
   $isMouseDown,
   $isMouseOver,
   $tool,
-  lineAdded,
-  pointsAddedToLastLine,
+  maskLayerLineAdded,
+  maskLayerPointsAdded,
 } from 'features/regionalPrompts/store/regionalPromptsSlice';
 import type Konva from 'konva';
 import type { KonvaEventObject } from 'konva/lib/Node';
@@ -64,7 +64,7 @@ export const useMouseEvents = () => {
       // const tool = getTool();
       if (tool === 'brush' || tool === 'eraser') {
         dispatch(
-          lineAdded({
+          maskLayerLineAdded({
             layerId: selectedLayerId,
             points: [Math.floor(pos.x), Math.floor(pos.y), Math.floor(pos.x), Math.floor(pos.y)],
             tool,
@@ -101,7 +101,7 @@ export const useMouseEvents = () => {
       }
       // const tool = getTool();
       if (getIsFocused(stage) && $isMouseOver.get() && $isMouseDown.get() && (tool === 'brush' || tool === 'eraser')) {
-        dispatch(pointsAddedToLastLine({ layerId: selectedLayerId, point: [Math.floor(pos.x), Math.floor(pos.y)] }));
+        dispatch(maskLayerPointsAdded({ layerId: selectedLayerId, point: [Math.floor(pos.x), Math.floor(pos.y)] }));
       }
     },
     [dispatch, selectedLayerId, tool]
@@ -140,7 +140,7 @@ export const useMouseEvents = () => {
         }
         if (tool === 'brush' || tool === 'eraser') {
           dispatch(
-            lineAdded({
+            maskLayerLineAdded({
               layerId: selectedLayerId,
               points: [Math.floor(pos.x), Math.floor(pos.y), Math.floor(pos.x), Math.floor(pos.y)],
               tool,
diff --git a/invokeai/frontend/web/src/features/regionalPrompts/store/regionalPromptsSlice.ts b/invokeai/frontend/web/src/features/regionalPrompts/store/regionalPromptsSlice.ts
index d326de6606..0c2de490c3 100644
--- a/invokeai/frontend/web/src/features/regionalPrompts/store/regionalPromptsSlice.ts
+++ b/invokeai/frontend/web/src/features/regionalPrompts/store/regionalPromptsSlice.ts
@@ -92,7 +92,7 @@ export const regionalPromptsSlice = createSlice({
   name: 'regionalPrompts',
   initialState: initialRegionalPromptsState,
   reducers: {
-    //#region Meta Layer
+    //#region Any Layers
     layerAdded: {
       reducer: (state, action: PayloadAction<Layer['kind'], string, { uuid: string }>) => {
         const kind = action.payload;
@@ -166,10 +166,6 @@ export const regionalPromptsSlice = createSlice({
       state.layers = state.layers.filter((l) => l.id !== action.payload);
       state.selectedLayerId = state.layers[0]?.id ?? null;
     },
-    allLayersDeleted: (state) => {
-      state.layers = [];
-      state.selectedLayerId = null;
-    },
     layerMovedForward: (state, action: PayloadAction<string>) => {
       const cb = (l: Layer) => l.id === action.payload;
       moveForward(state.layers, cb);
@@ -188,8 +184,12 @@ export const regionalPromptsSlice = createSlice({
       // Because the layers are in reverse order, moving to the back is equivalent to moving to the front
       moveToFront(state.layers, cb);
     },
+    allLayersDeleted: (state) => {
+      state.layers = [];
+      state.selectedLayerId = null;
+    },
     //#endregion
-    //#region RP Layers
+    //#region Mask Layers
     maskLayerPositivePromptChanged: (state, action: PayloadAction<{ layerId: string; prompt: string }>) => {
       const { layerId, prompt } = action.payload;
       const layer = state.layers.find((l) => l.id === layerId);
@@ -211,7 +211,7 @@ export const regionalPromptsSlice = createSlice({
         layer.previewColor = color;
       }
     },
-    lineAdded: {
+    maskLayerLineAdded: {
       reducer: (
         state,
         action: PayloadAction<
@@ -244,7 +244,7 @@ export const regionalPromptsSlice = createSlice({
         meta: { uuid: uuidv4() },
       }),
     },
-    pointsAddedToLastLine: (state, action: PayloadAction<{ layerId: string; point: [number, number] }>) => {
+    maskLayerPointsAdded: (state, action: PayloadAction<{ layerId: string; point: [number, number] }>) => {
       const { layerId, point } = action.payload;
       const layer = state.layers.find((l) => l.id === layerId);
       if (layer) {
@@ -318,26 +318,26 @@ class LayerColors {
 }
 
 export const {
-  // Meta layer actions
+  // Any layer actions
   layerAdded,
   layerDeleted,
   layerMovedBackward,
   layerMovedForward,
   layerMovedToBack,
   layerMovedToFront,
-  allLayersDeleted,
-  // Regional Prompt layer actions
-  maskLayerAutoNegativeChanged,
-  layerBboxChanged,
-  maskLayerPreviewColorChanged,
-  layerVisibilityToggled,
-  lineAdded,
-  maskLayerNegativePromptChanged,
-  pointsAddedToLastLine,
-  maskLayerPositivePromptChanged,
   layerReset,
   layerSelected,
   layerTranslated,
+  layerBboxChanged,
+  layerVisibilityToggled,
+  allLayersDeleted,
+  // Vector mask layer actions
+  maskLayerAutoNegativeChanged,
+  maskLayerPreviewColorChanged,
+  maskLayerLineAdded,
+  maskLayerNegativePromptChanged,
+  maskLayerPointsAdded,
+  maskLayerPositivePromptChanged,
   // General actions
   isEnabledChanged,
   brushSizeChanged,
@@ -405,13 +405,13 @@ export const regionalPromptsUndoableConfig: UndoableOptions<RegionalPromptsState
   undoType: undoRegionalPrompts.type,
   redoType: redoRegionalPrompts.type,
   groupBy: (action, state, history) => {
-    // Lines are started with `lineAdded` and may have any number of subsequent `pointsAddedToLastLine` events.
+    // Lines are started with `maskLayerLineAdded` and may have any number of subsequent `maskLayerPointsAdded` events.
     // We can use a double-buffer-esque trick to group each "logical" line as a single undoable action, without grouping
     // separate logical lines as a single undo action.
-    if (lineAdded.match(action)) {
+    if (maskLayerLineAdded.match(action)) {
       return history.group === LINE_1 ? LINE_2 : LINE_1;
     }
-    if (pointsAddedToLastLine.match(action)) {
+    if (maskLayerPointsAdded.match(action)) {
       if (history.group === LINE_1 || history.group === LINE_2) {
         return history.group;
       }