README.md: Add server upgrade instructions

616e22b2 · Jelle van der Waa · 7ea5243b · 616e22b2
Commit 616e22b2 authored Apr 27, 2018 by Jelle van der Waa 🚧
--- a/README.md
+++ b/README.md
@@ -30,6 +30,15 @@ The opendkim DNS data has to be added to DNS manually. The roles verifies that t

 The file that has to be added to the zone is `/etc/opendkim/private/$selector.txt`.

+#### Updating servers
+
+The following steps should be used to update our managed servers:
+
+* pacman -Syu
+* sync
+* checkservices
+* reboot
+
 ## Servers

 ### vostok