diff --git a/en_US/upgrade/0-upgrade.iredmail.0.9.6-0.9.7.md b/en_US/upgrade/0-upgrade.iredmail.0.9.6-0.9.7.md
index 05a9bf7a..0b2709db 100644
--- a/en_US/upgrade/0-upgrade.iredmail.0.9.6-0.9.7.md
+++ b/en_US/upgrade/0-upgrade.iredmail.0.9.6-0.9.7.md
@@ -379,9 +379,9 @@ Restarting Postfix service is required.
     * Please also upgrade iRedAPD and iRedAdmin-Pro, they need the new SQL
       structure too.
 
-After migration, few columns in `vmail.alias` table are not used anymore. it's
-ok to drop them. But it's strongly recommended to keep them for few more days
-until you can confirm all features are working as expected.
+After migration, `vmail.alias` table contains few sql columns we will never
+use, also old records (accounts) will cause ghost accounts if we don't remove
+them.
 
 Please connect to MySQL server as MySQL root user, then execute SQL commands
 below:
@@ -392,7 +392,7 @@ USE vmail;
 -- Remove non-mail-alias account
 DELETE FROM alias WHERE islist <> 1;
 
--- per-domain catch-all account
+-- Remove per-domain catch-all account
 DELETE FROM alias WHERE address=domain;
 
 -- Drop unused columns
diff --git a/html/upgrade.iredmail.0.9.6-0.9.7.html b/html/upgrade.iredmail.0.9.6-0.9.7.html
index a5c8363d..2bbeade8 100644
--- a/html/upgrade.iredmail.0.9.6-0.9.7.html
+++ b/html/upgrade.iredmail.0.9.6-0.9.7.html
@@ -395,9 +395,9 @@ perl -pi -e 's#alias,#forwardings,#g' *.cf
   structure too.</li>
 </ul>
 </div>
-<p>After migration, few columns in <code>vmail.alias</code> table are not used anymore. it's
-ok to drop them. But it's strongly recommended to keep them for few more days
-until you can confirm all features are working as expected.</p>
+<p>After migration, <code>vmail.alias</code> table contains few sql columns we will never
+use, also old records (accounts) will cause ghost accounts if we don't remove
+them.</p>
 <p>Please connect to MySQL server as MySQL root user, then execute SQL commands
 below:</p>
 <pre><code>USE vmail;
@@ -405,7 +405,7 @@ below:</p>
 -- Remove non-mail-alias account
 DELETE FROM alias WHERE islist &lt;&gt; 1;
 
--- per-domain catch-all account
+-- Remove per-domain catch-all account
 DELETE FROM alias WHERE address=domain;
 
 -- Drop unused columns