diff --git a/game_api.txt b/game_api.txt
index 61be13f5..841c6e20 100644
--- a/game_api.txt
+++ b/game_api.txt
@@ -214,6 +214,8 @@ The doors mod allows modders to register custom doors and trapdoors.
 	inventory_image = "mod_door_inv.png",
 	groups = {choppy = 2},
 	tiles = {"mod_door.png"}, -- UV map.
+	-- The front and back of the door must be identical in appearence as they swap on
+	-- open/close.
 	recipe = craftrecipe,
 	sounds = default.node_sound_wood_defaults(), -- optional
 	sound_open = sound play for open door, -- optional
@@ -228,7 +230,12 @@ The doors mod allows modders to register custom doors and trapdoors.
 	inventory_image = "mod_trapdoor_inv.png",
 	groups = {choppy = 2},
 	tile_front = "doors_trapdoor.png", -- the texture for the front and back of the trapdoor
-	tile_side = "doors_trapdoor_side.png", -- the tiles of the four side parts of the trapdoor
+	tile_side = "doors_trapdoor_side.png",
+	-- The texture for the four sides of the trapdoor.
+	-- The texture should have the trapdoor side drawn twice, in the lowest and highest
+	-- 1/8ths of the texture, both upright. The area between is not used.
+	-- The lower 1/8th will be used for the closed trapdoor, the higher 1/8th will be used
+	-- for the open trapdoor.
 	sounds = default.node_sound_wood_defaults(), -- optional
 	sound_open = sound play for open door, -- optional
 	sound_close = sound play for close door, -- optional
diff --git a/mods/doors/README.txt b/mods/doors/README.txt
index 9c114b0c..f9caaffc 100644
--- a/mods/doors/README.txt
+++ b/mods/doors/README.txt
@@ -40,8 +40,10 @@ Following textures created by PenguinDad (CC BY-SA 4.0):
 
 Following textures created by sofar (CC-BY-SA-3.0):
   doors_trapdoor_steel.png
-  doors_trapdoor_steel_side.png
+
+Following textures created by paramat (CC-BY-SA-3.0):
   door_trapdoor_side.png
+  doors_trapdoor_steel_side.png
 
 Obsidian door textures by red-001 based on textures by Pilzadam and BlockMen (CC BY-SA 3.0):
   door_obsidian_glass.png
diff --git a/mods/doors/init.lua b/mods/doors/init.lua
index 20ce026d..dff65c7f 100644
--- a/mods/doors/init.lua
+++ b/mods/doors/init.lua
@@ -642,10 +642,14 @@ function doors.register_trapdoor(name, def)
 		type = "fixed",
 		fixed = {-0.5, -0.5, -0.5, 0.5, -6/16, 0.5}
 	}
-	def_closed.tiles = {def.tile_front,
-			def.tile_front .. '^[transformFY',
-			def.tile_side, def.tile_side,
-			def.tile_side, def.tile_side}
+	def_closed.tiles = {
+		def.tile_front,
+		def.tile_front .. '^[transformFY',
+		def.tile_side,
+		def.tile_side,
+		def.tile_side,
+		def.tile_side
+	}
 
 	def_opened.node_box = {
 		type = "fixed",
@@ -655,11 +659,14 @@ function doors.register_trapdoor(name, def)
 		type = "fixed",
 		fixed = {-0.5, -0.5, 6/16, 0.5, 0.5, 0.5}
 	}
-	def_opened.tiles = {def.tile_side, def.tile_side,
-			def.tile_side .. '^[transform3',
-			def.tile_side .. '^[transform1',
-			def.tile_front .. '^[transform46',
-			def.tile_front .. '^[transform6'}
+	def_opened.tiles = {
+		def.tile_side,
+		def.tile_side .. '^[transform2',
+		def.tile_side .. '^[transform3',
+		def.tile_side .. '^[transform1',
+		def.tile_front .. '^[transform46',
+		def.tile_front .. '^[transform6'
+	}
 
 	def_opened.drop = name_closed
 	def_opened.groups.not_in_creative_inventory = 1
diff --git a/mods/doors/textures/doors_trapdoor_side.png b/mods/doors/textures/doors_trapdoor_side.png
index 4a8b99f2..55981ea3 100644
Binary files a/mods/doors/textures/doors_trapdoor_side.png and b/mods/doors/textures/doors_trapdoor_side.png differ
diff --git a/mods/doors/textures/doors_trapdoor_steel_side.png b/mods/doors/textures/doors_trapdoor_steel_side.png
index 44c4344b..e29c59e0 100644
Binary files a/mods/doors/textures/doors_trapdoor_steel_side.png and b/mods/doors/textures/doors_trapdoor_steel_side.png differ