howto/upgrades.md

@@ -397,7 +397,7 @@ The [Karma alert
 dashboard](https://karma.torproject.org/?q=%40state%3Dactive&q=alertname%3DNeedsReboot)
 will show remaining hosts that might have been missed by the above procedure.
 
-But if you want to run more upgrades in parallels and are doing a
+But if you want to run more upgrades in parallel and are doing a
 fleet-wide reboot, while running the Ganeti reboots (above), you can
 perform reboots on the hosts _not_ on Ganeti cluster by pulling the
 list of hosts from LDAP: