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diff --git a/docs/html/guide/publishing/preparing.jd b/docs/html/guide/publishing/preparing.jd
index 4d3bffa..83aa5ee 100644
--- a/docs/html/guide/publishing/preparing.jd
+++ b/docs/html/guide/publishing/preparing.jd
@@ -117,6 +117,9 @@ Android system allows you to sign your applications with a self-signed certifica
certificate requirements, see <a href="{@docRoot}guide/publishing/app-signing.html#cert">Obtain a
suitable private key</a>.</p>
+<p class="caution"><strong>Important:</strong> Your application must be signed with a cryptographic
+key whose validity period ends after 22 October 2033.</p>
+
<p>You may also have to obtain other release keys if your application accesses a service or uses a
third-party library that requires you to use a key that is based on your private key. For example,
if your application uses the <a