diff --git a/Installation.md b/Installation.md
index d2448a2..4d7f74b 100644
--- a/Installation.md
+++ b/Installation.md
@@ -17,7 +17,7 @@ If you don't want to recompile every time when you run your game, you can instal
 go install github.com/hajimehoshi/ebiten/...
 ```
 
-# Modules
+# Modules (Go 1.11 beta 2)
 
 As of Go 1.11, modules are introduced experimentally. If you want to use Ebiten with modules, execute these commands with Go 1.11 beta 2: