diff --git a/README.md b/README.md
index 62909069d77474e41ac1757a8fdd7aec27581904..87f5ec86ce661d8ab6d71a34794cde89098fc3df 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ Before we start this tutorial, students should prepare the basic code of self ro
 The example of the first code will be shown the first part.
 
 The whole tutorial will be followed by some codes that changed by each steps.
+**Every steps has the codes of it, output result, and some gif files that help students to understand it well.**
 There are 3 steps in this tutorial.
 
 ## Step 0. Before we start! You have to prepare...