From DoomWiki.org
Minor request[edit]
If you wouldn't mind, please maintain the following markup and content when adding walkthroughs to level articles:
Letters in italics refer to marked spots on the map. Sector numbers in boldface are secrets which count towards the end-of-level tally.
===Essentials===
It is standard to place the walkthrough information inside the "essentials" subsection, and the boilerplate information should apply to edits that users may make after you have added your own information, and so is still relevant even if you yourself didn't add any info following those tips. Thanks. --Quasar (talk) 12:13, 31 July 2015 (CDT)