diff --git a/README.md b/README.md
index 2eade70..61d1e9d 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,13 @@ There are occasions users prefer to be offline, such as when they
 ride on a bus. A phone would be more often used in such case, which is why I made this
 as an Android app.
 
+## How to run
+
+[Android's document][android] gives detailed instruction of
+how to build run Android apps from source code. It also includes instruction
+for command line build in case you don't want to install Android Studio.
+You need Gradle 4.0.1 and Kotlin 1.3.72 or later for the build.
+
 ## To-do list
 
 A check list for development tasks.
@@ -44,6 +51,7 @@ A check list for development tasks.
 	- [ ] `generate()`
 	- [ ] `rewrite()`
 
+[android]: https://developer.android.com/studio/run
 [awkword]: http://akana.conlang.org/tools/awkwords/
 [zompist]: http://www.zompist.com/gen.html
 [saass]: https://www.gnu.org/philosophy/who-does-that-server-really-serve.html