diff --git a/README.md b/README.md
index 9f66b89..0a7c8ec 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ Opening video fits the window to its display aspect ratio, including non-square
 
 - **Space:** play/pause. **←/→:** seek five seconds. The timeline slider seeks on release and holds the requested position until the core finishes queued seeks; old playback snapshots cannot pull the thumb back.
 - **↑/↓:** adjust volume by five percent. **M:** mute/unmute, restoring the previous audible level. The volume thumb is opaque light gray, independent of the frosted panel behind it.
+- Both slider tracks span the native thumb-center travel range; the orange volume fill ends at the current thumb center.
 - **Double-click video**, **F**, or **⌃⌘F:** toggle native fullscreen. **Esc:** leave fullscreen.
 - **Single-click video:** hide controls. Mouse movement reveals them; they fade after 2.5 seconds, including while paused. Hovering the titlebar/controller, dragging, seeking, an inactive window, errors, or VoiceOver keep them visible.
 - Click the right-hand time label to switch between total and remaining time. The titlebar pin keeps the window on top.
diff --git a/Sources/App/PlayerApp.swift b/Sources/App/PlayerApp.swift
index cdcfb01..f3e3092 100644
--- a/Sources/App/PlayerApp.swift
+++ b/Sources/App/PlayerApp.swift
@@ -378,7 +378,8 @@ private struct PlaybackSlider: NSViewRepresentable {
     final class Cell: NSSliderCell {
         var volume = false
         override func drawBar(inside rect: NSRect, flipped: Bool) {
-            let bar = NSRect(x: rect.minX, y: rect.midY - 1.5, width: rect.width, height: 3)
+            let bar = NSRect(x: rect.minX + knobThickness / 2, y: rect.midY - 1.5,
+                             width: max(0, rect.width - knobThickness), height: 3)
             NSColor.white.withAlphaComponent(0.12).setFill()
             NSBezierPath(roundedRect: bar, xRadius: 1.5, yRadius: 1.5).fill()
             if volume {