diff --git a/iOS.md b/iOS.md
index 7130acd..043091b 100644
--- a/iOS.md
+++ b/iOS.md
@@ -1,3 +1,7 @@
+# This document describes about a deprecated feature. Use `ebitenmobile` command instead. See https://ebiten.org/mobile.html
+
+***
+
 See the document [[Mobile]] for details common in Android and iOS.
 
 In this article, we explain `gomobile bind` usage, not `gomobile build` usage.