diff --git a/en_US/iredmail-easy/4-iredmail-easy.release.notes.md b/en_US/iredmail-easy/4-iredmail-easy.release.notes.md
index 458e995d..684b4bd2 100644
--- a/en_US/iredmail-easy/4-iredmail-easy.release.notes.md
+++ b/en_US/iredmail-easy/4-iredmail-easy.release.notes.md
@@ -5,6 +5,14 @@
 ## Version: 2020082501 (Aug 25, 2020) {: id=20200825 }
 
 * SOGo:
+
+    !!! warning
+
+        SOGo may not successfully kill all its child processes and causes sogo
+        service failed to start. If it occurs, please stop SOGo service manually
+        (`service sogo stop`), kill orphan processes (`pkill -9 sogod`), then start
+        it manually (`service sogo restart`).
+
     - Upgrade SOGo to the latest v5 branch (nightly bulid) on Linux.
     - With SOGo v5, it now send email via submission service (port 587) without
       ssl cert verification.
diff --git a/html/iredmail-easy.release.notes.html b/html/iredmail-easy.release.notes.html
index 1b278788..bd641996 100644
--- a/html/iredmail-easy.release.notes.html
+++ b/html/iredmail-easy.release.notes.html
@@ -51,6 +51,13 @@
 <ul>
 <li>
 <p>SOGo:</p>
+<div class="admonition warning">
+<p class="admonition-title">Warning</p>
+<p>SOGo may not successfully kill all its child processes and causes sogo
+service failed to start. If it occurs, please stop SOGo service manually
+(<code>service sogo stop</code>), kill orphan processes (<code>pkill -9 sogod</code>), then start
+it manually (<code>service sogo restart</code>).</p>
+</div>
 <ul>
 <li>Upgrade SOGo to the latest v5 branch (nightly bulid) on Linux.</li>
 <li>With SOGo v5, it now send email via submission service (port 587) without