diff --git a/src/wayland/surface_interface.cpp b/src/wayland/surface_interface.cpp
index 3b78664436..e61d5794ba 100644
--- a/src/wayland/surface_interface.cpp
+++ b/src/wayland/surface_interface.cpp
@@ -43,6 +43,7 @@ void SurfaceInterface::Private::addChild(QPointer< SubSurfaceInterface > child)
     subSurfacePending.children.append(child);
     current.children.append(child);
     Q_Q(SurfaceInterface);
+    emit q->childSubSurfaceAdded(child);
     emit q->subSurfaceTreeChanged();
     QObject::connect(child.data(), &SubSurfaceInterface::positionChanged, q, &SurfaceInterface::subSurfaceTreeChanged);
     QObject::connect(child->surface().data(), &SurfaceInterface::damaged, q, &SurfaceInterface::subSurfaceTreeChanged);
@@ -57,6 +58,7 @@ void SurfaceInterface::Private::removeChild(QPointer< SubSurfaceInterface > chil
     subSurfacePending.children.removeAll(child);
     current.children.removeAll(child);
     Q_Q(SurfaceInterface);
+    emit q->childSubSurfaceRemoved(child);
     emit q->subSurfaceTreeChanged();
     QObject::disconnect(child.data(), &SubSurfaceInterface::positionChanged, q, &SurfaceInterface::subSurfaceTreeChanged);
     if (!child->surface().isNull()) {
diff --git a/src/wayland/surface_interface.h b/src/wayland/surface_interface.h
index fb61978fda..ad8f24e415 100644
--- a/src/wayland/surface_interface.h
+++ b/src/wayland/surface_interface.h
@@ -330,6 +330,16 @@ Q_SIGNALS:
      * @since 5.22
      **/
     void subSurfaceTreeChanged();
+    /**
+     * Emitted whenever a new child sub-surface @p subSurface is added.
+     * @since 5.70
+     */
+    void childSubSurfaceAdded(SubSurfaceInterface *subSurface);
+    /**
+     * Emitted whenver the child sub-surface @p subSurface is removed.
+     * @since 5.70
+     */
+    void childSubSurfaceRemoved(SubSurfaceInterface *subSurface);
 
     /**
      * Emitted whenever a pointer constraint get (un)installed on this SurfaceInterface.