diff --git a/README.md b/README.md
index 9181bf1..50d2b24 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,6 @@ modname_[addprefix_][variant_][name_][tiletype].ext
   - variant - determinate some nodes parameter: 
     - Supported: brick, cobblestone, dirt, grass, ice, iron, sandstone, stone, item (=will be skipped)
   - tiletype - defines the tile position
-    - Supported: top, bottom, down, right, left, back, front, side, normal
+    - Supported: top, bottom, down, right, left, back, inner, front, side, normal
   - name - additional string makes the nodename unique. Note: if tieltype or variant is not valid, you find it as a part of the name
   - ext - File extendion as supported by minetest
diff --git a/init.lua b/init.lua
index 8d90134..9b26129 100644
--- a/init.lua
+++ b/init.lua
@@ -62,6 +62,7 @@ function customnode.get_nodelist_by_textures(prefix, generator_mapping)
 		right = "right",
 		left = "left",
 		back = "back",
+		inner = "back",
 		front = "front",
 		side = "all",
 		normal = "all",