diff --git a/src/docs/user/configuration/configuring_backups.diviner b/src/docs/user/configuration/configuring_backups.diviner
--- a/src/docs/user/configuration/configuring_backups.diviner
+++ b/src/docs/user/configuration/configuring_backups.diviner
@@ -24,6 +24,12 @@
 will just backup the old machine and then restore the data onto the new
 machine.
 
+WARNING: You need to restart Phabricator after restoring data.
+
+Restarting Phabricator after performing a restore makes sure that caches are
+flushed properly. For complete instructions, see
+@{article:Restarting Phabricator}.
+
 
 Backup: MySQL Databases
 =======================