diff --git a/README.md b/README.md
index 730b4e8..901b572 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,5 @@
-# minetest-mesecons-circuits
-Minetest World - Mesecons Circuits
+# Minetest World - Mesecons Circuits
+
+## 4-bit decoder
+
+![4-bit decoder](https://cloud.githubusercontent.com/assets/51875/23898649/b59f193a-0901-11e7-83e4-b1aca3eaf742.png)