diff --git a/en_US/howto/concurrent.processing.md b/en_US/howto/concurrent.processing.md
index 07cf6045..f5db47fb 100644
--- a/en_US/howto/concurrent.processing.md
+++ b/en_US/howto/concurrent.processing.md
@@ -2,8 +2,9 @@
 
 !!! attention
 
-    Processing more emails concurrently require more RAM, please make sure you
-    have enough RAM to handle them.
+    Processing more emails concurrently requires more RAM, please make sure you
+    have enough RAM to handle them, otherwise ClamAV may exit randomly due to
+    no enough memory (for ClamAV).
 
 Amavisd-new is content filter, it invokes SpamAssassin and ClamAV for
 spam/virus scanning, it also offers additional features like DKIM signing and
diff --git a/html/concurrent.processing.html b/html/concurrent.processing.html
index 69c07e37..b8c47e41 100644
--- a/html/concurrent.processing.html
+++ b/html/concurrent.processing.html
@@ -18,8 +18,9 @@
     &nbsp;&nbsp;//&nbsp;&nbsp;<a href="./index.html">Document Index</a></div><h1 id="process-more-emails-concurrently">Process more emails concurrently</h1>
 <div class="admonition attention">
 <p class="admonition-title">Attention</p>
-<p>Processing more emails concurrently require more RAM, please make sure you
-have enough RAM to handle them.</p>
+<p>Processing more emails concurrently requires more RAM, please make sure you
+have enough RAM to handle them, otherwise ClamAV may exit randomly due to
+no enough memory (for ClamAV).</p>
 </div>
 <p>Amavisd-new is content filter, it invokes SpamAssassin and ClamAV for
 spam/virus scanning, it also offers additional features like DKIM signing and