Article in a German magazine by Peter Hruschka und Gernot Starke "Erinnern kann Papier erheblich besser als Hirn" (translated as "Paper recalls much better than the brain"). Both authors share their insights in documenting software systems and software architectures by publishing their arc42 Template. There are plenty of resources on the internet. In case you are using the projectdoc Toolbox you may have a look at the arc42 Doctype Add-on which provides the arc42 Template for Confluence.