Add notice about the arch restrictions for Android.
diff --git a/Mobile.md b/Mobile.md
index 2ce5407..dc2837c 100644
--- a/Mobile.md
+++ b/Mobile.md
@@ -104,6 +104,8 @@
 
 ### Building and deploying to Android
 
+Note: Currently only ARM devices and ARM emulating AVDs are supported.
+
 If you are using Android Studio, you can use the [Gradle plugin](https://plugins.gradle.org/plugin/org.golang.mobile.bind) to automate this process.
 
 * Launch Android Studio.