diff --git a/en_US/howto/upgrade.debian.10-11.md b/en_US/howto/upgrade.debian.10-11.md
index eccd2580..59877bfa 100644
--- a/en_US/howto/upgrade.debian.10-11.md
+++ b/en_US/howto/upgrade.debian.10-11.md
@@ -6,6 +6,11 @@
 
     This is still a DRAFT document, it may miss some other important changes.
 
+## SOGo Groupware
+
+SOGo team doesn't offer binary packages for Debian 11 yet, so you can not use
+SOGo at all.
+
 ## iRedAPD and iRedAdmin(-Pro)
 
 Debian 11 offers newer Python release, few Python modules must be re-installed:
diff --git a/html/upgrade.debian.10-11.html b/html/upgrade.debian.10-11.html
index a3a3613d..0c48e360 100644
--- a/html/upgrade.debian.10-11.html
+++ b/html/upgrade.debian.10-11.html
@@ -19,6 +19,7 @@
 <div class="toc">
 <ul>
 <li><a href="#fixes-you-need-after-upgrading-debian-from-10-to-11">Fixes you need after upgrading Debian from 10 to 11</a><ul>
+<li><a href="#sogo-groupware">SOGo Groupware</a></li>
 <li><a href="#iredapd-and-iredadmin-pro">iRedAPD and iRedAdmin(-Pro)</a></li>
 </ul>
 </li>
@@ -28,6 +29,9 @@
 <p class="admonition-title">Warning</p>
 <p>This is still a DRAFT document, it may miss some other important changes.</p>
 </div>
+<h2 id="sogo-groupware">SOGo Groupware</h2>
+<p>SOGo team doesn't offer binary packages for Debian 11 yet, so you can not use
+SOGo at all.</p>
 <h2 id="iredapd-and-iredadmin-pro">iRedAPD and iRedAdmin(-Pro)</h2>
 <p>Debian 11 offers newer Python release, few Python modules must be re-installed:</p>
 <pre><code>pip3 install -U web.py