diff --git a/docs/html/training/system-ui/navigation.jd b/docs/html/training/system-ui/navigation.jd
index 3907bb2164f2f..1c73c703891dd 100644
--- a/docs/html/training/system-ui/navigation.jd
+++ b/docs/html/training/system-ui/navigation.jd
@@ -63,6 +63,9 @@ user experience. </p>
 the navigation bar and the status bar:</p>
 <pre>View decorView = getWindow().getDecorView();
 // Hide both the navigation bar and the status bar.
+// SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as
+// a general rule, you should design your app to hide the status bar whenever you
+// hide the navigation bar.
 int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
               | View.SYSTEM_UI_FLAG_FULLSCREEN;
 decorView.setSystemUiVisibility(uiOptions);</pre>