diff --git a/services/inputflinger/include/InputReaderBase.h b/services/inputflinger/include/InputReaderBase.h
index e9737dd..efc8b26 100644
--- a/services/inputflinger/include/InputReaderBase.h
+++ b/services/inputflinger/include/InputReaderBase.h
@@ -452,11 +452,14 @@
     /* Returns true if any InputConnection is currently active. */
     virtual bool isInputMethodConnectionActive() = 0;
 
-    /* Gets the viewport of a particular display. The logical bounds of the viewport should be used
-     * as the range of possible values for pointing devices, like mice and touchpads.
+    /* Gets the viewport of a particular display that the pointer device is associated with. If
+     * the pointer device is not associated with any display, it should ADISPLAY_IS_NONE to get
+     * the viewport that should be used. The device should get a new viewport using this method
+     * every time there is a display configuration change. The logical bounds of the viewport should
+     * be used as the range of possible values for pointing devices, like mice and touchpads.
      */
-    virtual std::optional<DisplayViewport> getViewportForPointerDevice(
-            int32_t associatedDisplayId) = 0;
+    virtual std::optional<DisplayViewport> getPointerViewportForAssociatedDisplay(
+            int32_t associatedDisplayId = ADISPLAY_ID_NONE) = 0;
 };
 
 } // namespace android
diff --git a/services/inputflinger/include/PointerChoreographerPolicyInterface.h b/services/inputflinger/include/PointerChoreographerPolicyInterface.h
index 93c0bdf..8b47b55 100644
--- a/services/inputflinger/include/PointerChoreographerPolicyInterface.h
+++ b/services/inputflinger/include/PointerChoreographerPolicyInterface.h
@@ -41,6 +41,12 @@
     virtual std::shared_ptr<PointerControllerInterface> createPointerController(
             PointerControllerInterface::ControllerType type) = 0;
 
+    /**
+     * Notifies the policy that the default pointer displayId has changed. PointerChoreographer is
+     * the single source of truth for all pointers on screen.
+     * @param displayId The updated display on which the mouse cursor is shown
+     * @param position The new position of the mouse cursor on the logical display
+     */
     virtual void notifyPointerDisplayIdChanged(int32_t displayId, const FloatPoint& position) = 0;
 };