Docs: comment BKE_scene_set_background

source/blender/blenkernel/intern/scene.c

@@ -756,6 +756,11 @@ Base *BKE_scene_base_find(Scene *scene, Object *ob)
 	return BLI_findptr(&scene->base, ob, offsetof(Base, object));
 }
 
+/**
+ * Sets the active scene, mainly used when running in background mode (``--scene`` command line argument).
+ * This is also called to set the scene directly, bypassing windowing code.
+ * Otherwise #ED_screen_set_scene is used when changing scenes by the user.
+ */
 void BKE_scene_set_background(Main *bmain, Scene *scene)
 {
 	Scene *sce;