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+++ b/en/security/encryption/file-based.html
@@ -33,6 +33,13 @@ This article describes how to enable file-based encryption on new devices
and how system applications can be updated to take full advantage of the new
Direct Boot APIs and offer users the best, most secure experience possible.
</p>
+
+<p class="warning"><strong>Warning:</strong> File-based encryption cannot
+currently be used together with <a
+href="/devices/storage/adoptable.html">adoptable storage</a>. On devices using
+file-based encryption, new storage media (such as an SD card) must be used as
+<a href="/devices/storage/traditional.html">traditional storage</a>.</p>
+
<h2 id="direct-boot">Direct Boot</h2>
<p>
File-based encryption enables a new feature introduced in Android 7.0 called <a