diff --git a/stairs.lua b/stairs.lua
index 1f2e988..193b463 100644
--- a/stairs.lua
+++ b/stairs.lua
@@ -15,6 +15,7 @@ darkage.register_stairs("darkage:ors_brick")
 darkage.register_stairs("darkage:ors_rubble")
 darkage.register_stairs("darkage:rhyolitic_tuff")
 darkage.register_stairs("darkage:rhyolitic_tuff_bricks")
+darkage.register_stairs("darkage:rhyolitic_tuff_rubble")
 darkage.register_stairs("darkage:schist")
 darkage.register_stairs("darkage:serpentine")
 darkage.register_stairs("darkage:shale")
@@ -26,4 +27,5 @@ darkage.register_stairs("darkage:stone_brick")
 darkage.register_stairs("darkage:straw_bale")
 darkage.register_stairs("darkage:tuff")
 darkage.register_stairs("darkage:tuff_bricks")
+darkage.register_stairs("darkage:tuff_rubble")