diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,16 +1,18 @@
-# ohthatsa
+# OhThatsA [![Build Status](https://drone.broodjeaap.net/api/badges/broodjeaap/OhThatsA/status.svg)](https://drone.broodjeaap.net/broodjeaap/OhThatsA)
 
 An app to help you learn how to calculate day of the week from any date.
 
-## Getting Started
+## App
+<img src="media/img/main.png" alt="main" width="200"/>
+<img src="media/img/year_instruction.png" alt="year_instruction" width="200"/>
+<img src="media/img/month_practice.png" alt="month_practice" width="200"/>  
 
-This project is a starting point for a Flutter application.
+Mostly made to try out Dart/Flutter.
 
-A few resources to get you started if this is your first Flutter project:
+## Method
 
-- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
+The day of the week can be calculated by:  
+`(day value + month value + year value + century value + leap year value) % 7`
 
-For help getting started with Flutter development, view the
-[online documentation](https://docs.flutter.dev/), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
+Every one of these value comes from a set of constants or is calculable from the date.  
+This app helps you practice memorizing and calculating these values.
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