diff --git a/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/DefaultFrameRenderer.java b/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/DefaultFrameRenderer.java
index a4a35ef..f9b1ede 100644
--- a/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/DefaultFrameRenderer.java
+++ b/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/DefaultFrameRenderer.java
@@ -100,9 +100,8 @@ public DefaultFrameRenderer(
     @Override
     public void paintFrame(
             @NotNull Graphics2D g2,
-            @NotNull FrameModel<@NotNull T> frameModel,
+            @NotNull FrameBox<@NotNull T> frame, @NotNull FrameModel<@NotNull T> frameModel,
             @NotNull RectangularShape frameRect,
-            @NotNull FrameBox<@NotNull T> frame,
             @NotNull Rectangle2D paintableIntersection,
             int renderFlags
     ) {
@@ -264,7 +263,7 @@ private String calculateFrameText(
     }
 
     @Override
-    public RectangularShape reusableFrameRect() {
+    public RectangularShape reusableFrameShape() {
         return roundedFrame ? new RoundRectangle2D.Double(
                 0, 0, 0, 0, 5, 5
         ) : new Rectangle2D.Double();
diff --git a/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/FlamegraphRenderEngine.java b/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/FlamegraphRenderEngine.java
index 140ea1e..30b2f14 100644
--- a/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/FlamegraphRenderEngine.java
+++ b/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/FlamegraphRenderEngine.java
@@ -307,7 +307,7 @@ private void internalPaint(
         var frames = frameModel.frames;
         // paint root
         {
-            var rootFrameShape = frameRenderer.reusableFrameRect(); // reusable rectangle
+            var rootFrameShape = frameRenderer.reusableFrameShape(); // reusable rectangle
             var rootFrame = frames.get(0);
 
             int internalPadding = 0; // Remove ?
@@ -321,9 +321,8 @@ private void internalPaint(
             if (!paintableIntersection.isEmpty()) {
                 frameRenderer.paintFrame(
                         g2d,
-                        frameModel,
+                        rootFrame, frameModel,
                         rootFrameShape,
-                        rootFrame,
                         paintableIntersection,
                         FrameRenderingFlags.toFlags(
                                 minimapMode,
@@ -340,7 +339,7 @@ private void internalPaint(
         }
 
         // paint real flames
-        var frameShape = frameRenderer.reusableFrameRect(); // reusable rectangle
+        var frameShape = frameRenderer.reusableFrameShape(); // reusable rectangle
         for (int i = 1; i < frames.size(); i++) {
             var frame = frames.get(i);
 
@@ -359,9 +358,8 @@ private void internalPaint(
             if (!paintableIntersection.isEmpty()) {
                 frameRenderer.paintFrame(
                         g2d,
-                        frameModel,
+                        frame, frameModel,
                         frameShape,
-                        frame,
                         paintableIntersection,
                         // choose font depending on whether the left-side of the frame is clipped
                         FrameRenderingFlags.toFlags(
diff --git a/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/FrameRenderer.java b/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/FrameRenderer.java
index 269ac04..34bccdb 100644
--- a/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/FrameRenderer.java
+++ b/fireplace-swing/src/main/java/io/github/bric3/fireplace/flamegraph/FrameRenderer.java
@@ -1,5 +1,6 @@
 package io.github.bric3.fireplace.flamegraph;
 
+import org.jetbrains.annotations.ApiStatus.Experimental;
 import org.jetbrains.annotations.NotNull;
 
 import java.awt.*;
@@ -13,6 +14,7 @@
  * @see FlamegraphView
  */
 // TODO root frame renderer ?
+@Experimental
 public interface FrameRenderer<T> {
     /**
      * The size of the gap at between each side of a frame.
@@ -46,9 +48,9 @@ public interface FrameRenderer<T> {
      * using the {@link FrameRenderingFlags} methods.
      *
      * @param g2                    the graphics context
+     * @param frame                 the frame to paint
      * @param frameModel            the frame model
      * @param frameRect             the frame region (may fall outside visible area).
-     * @param frame                 the frame to paint
      * @param paintableIntersection the intersection between the frame rectangle and the visible region
      *                              (can be used to position the text label).
      * @param renderFlags           the rendering flags (minimap, selection, hovered, highlight, etc.)
@@ -56,14 +58,21 @@ public interface FrameRenderer<T> {
      */
     void paintFrame(
             @NotNull Graphics2D g2,
+            @NotNull FrameBox<T> frame,
             @NotNull FrameModel<T> frameModel,
             @NotNull RectangularShape frameRect,
-            @NotNull FrameBox<T> frame,
             @NotNull Rectangle2D paintableIntersection,
             int renderFlags
     );
 
-    default RectangularShape reusableFrameRect() {
+    /**
+     * A factory for the frame rectangle shape, this shape is reused.
+     * Usually the frame will be a standard rectangle; however, the implementation may want to
+     * use a different shape (e.g., a rounded rectangle).
+     * This instance is likely to be reused for each frame.
+     * @return a new instance of the frame shape.
+     */
+    default RectangularShape reusableFrameShape() {
         return new Rectangle2D.Double();
     }
 }