Update README.md

README.md

@@ -12,7 +12,13 @@ Arithmetic run is a open source, cross-platform 2D game made in Java with libGDX
 [<img src="https://img.stackshare.io/service/995/K85ZWV2F.png" height="60px"><img src="https://img.stackshare.io/service/1010/m8jf0po4imu8t5eemjdd.png" height="60px"><img src="https://img.stackshare.io/service/4339/3c827c8875b77acbbaf83c73eecd0a43_400x400.png" height="60px"><img src="https://img.stackshare.io/service/27/sBsvBbjY.png" height="60px"><img src="https://img.stackshare.io/service/975/gradlephant-social-black-bg.png" height="60px"><img src="https://img.stackshare.io/service/2020/874086.png" height="60px"><img src="https://img.stackshare.io/service/11563/actions.png" height="60px"><img src="https://img.stackshare.io/service/2673/Codecov_Mark_Circle_Pink.png" height="60px">](https://stackshare.io/lincolncpp/corrida-aritmetica)
 
 ## Documentation
-The documentation was generated by Javadoc and can be accessed on [project page](https://lincolncpp.github.io/corrida-aritmetica/).
+You can generate the `/docs` by using
+```
+make docs
+```
+It uses javadoc to generate a documentation from the source code.
+
+The documentation can be accessed on [project page](https://lincolncpp.github.io/corrida-aritmetica/).
 
 ## Authors