diff --git a/develop/print.html b/develop/print.html
index b9b56983d2..91c24cd497 100644
--- a/develop/print.html
+++ b/develop/print.html
@@ -1612,6 +1612,20 @@ dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
</code></pre>
</li>
</ul>
+<h1 id="upgrading-to-v1660"><a class="header" href="#upgrading-to-v1660">Upgrading to v1.66.0</a></h1>
+<h2 id="delegation-of-email-validation-no-longer-supported"><a class="header" href="#delegation-of-email-validation-no-longer-supported">Delegation of email validation no longer supported</a></h2>
+<p>As of this version, Synapse no longer allows the tasks of verifying email address
+ownership, and password reset confirmation, to be delegated to an identity server.
+This removal was previously planned for Synapse 1.64.0, but was
+<a href="https://github.com/matrix-org/synapse/issues/13421">delayed</a> until now to give
+homeserver administrators more notice of the change.</p>
+<p>To continue to allow users to add email addresses to their homeserver accounts,
+and perform password resets, make sure that Synapse is configured with a working
+email server in the <a href="https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#email"><code>email</code> configuration
+section</a>
+(including, at a minimum, a <code>notif_from</code> setting.)</p>
+<p>Specifying an <code>email</code> setting under <code>account_threepid_delegates</code> will now cause
+an error at startup.</p>
<h1 id="upgrading-to-v1640"><a class="header" href="#upgrading-to-v1640">Upgrading to v1.64.0</a></h1>
<h2 id="deprecation-of-the-ability-to-delegate-e-mail-verification-to-identity-servers"><a class="header" href="#deprecation-of-the-ability-to-delegate-e-mail-verification-to-identity-servers">Deprecation of the ability to delegate e-mail verification to identity servers</a></h2>
<p>Synapse v1.66.0 will remove the ability to delegate the tasks of verifying email address ownership, and password reset confirmation, to an identity server.</p>
@@ -4933,7 +4947,9 @@ their account.</p>
<p>(Servers handling the these requests must answer the <code>/requestToken</code> endpoints defined
by the Matrix Identity Service API
<a href="https://matrix.org/docs/spec/identity_service/latest">specification</a>.)</p>
-<p><em>Updated in Synapse 1.64.0</em>: The <code>email</code> option is deprecated.</p>
+<p><em>Deprecated in Synapse 1.64.0</em>: The <code>email</code> option is deprecated.</p>
+<p><em>Removed in Synapse 1.66.0</em>: The <code>email</code> option has been removed.
+If present, Synapse will report a configuration error on startup.</p>
<p>Example configuration:</p>
<pre><code class="language-yaml">account_threepid_delegates:
msisdn: http://localhost:8090 # Delegate SMS sending to this local process
@@ -11476,6 +11492,7 @@ If the room does not define a type, the value will be <code>null</code>.</li>
"forgotten": false
}
</code></pre>
+<p><em>Changed in Synapse 1.66:</em> Added the <code>forgotten</code> key to the response body.</p>
<h1 id="room-members-api"><a class="header" href="#room-members-api">Room Members API</a></h1>
<p>The Room Members admin API allows server admins to get a list of all members of a room.</p>
<p>The response includes the following fields:</p>
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