diff --git a/drmdisplaycomposition.h b/drmdisplaycomposition.h
index e79466e..9be5fdd 100644
--- a/drmdisplaycomposition.h
+++ b/drmdisplaycomposition.h
@@ -131,6 +131,9 @@
 
   int IncreaseTimelineToPoint(int point);
 
+  void EmplaceCompositionPlane(size_t source_layer,
+                               std::vector<DrmPlane *> *primary_planes,
+                               std::vector<DrmPlane *> *overlay_planes);
   int CreateAndAssignReleaseFences();
 
   DrmResources *drm_ = NULL;