Per 
Item #: SCP-0w0-J
Object Class: Keter
Special Containment Procedures: The subject is to be contained in the windowless cell in Sector C, room 69XD. There are to be four armed guards on each side of the cell. Every 24 hours the guards on post will rotate. Once the new guards are on site, one will feed 25 pieces of dry cat food through the sending end of a long tube, leading into the cell. This will continue on repeat for 24 hours a day, 7 days a week.
Description: SCP 0w0-J seems normal at first, looking similar to a house cat. This is how everybody but the
Addendum: [Optional additional paragraphs]
The article begins with the SCP number, which is what the article calls the anomaly, and the object class, which explains how hard the anomaly is to keep contained. The three main object classes are Safe, Euclid, and Keter. Some SCPs use others instead of or in addition to those, like Thaumiel, Neutralized, and Explained. You can read about them in the Object Classes guide.
Containment procedures tell the reader what the Foundation does to keep the anomaly locked up. They should be clear and logical. Write them from the point of view of an organization telling their employees how to prevent the object from escaping or discovered by the public. Try not to make the Foundation look too incompetent or silly to be believed.
Description is the section that tells the reader what the anomaly is. It should be concise and practical. Start with the most basic and important information, so the reader understands what you're talking about right away. Write as if you're a researcher for the Foundation on an important professional task. Use a plain, precise style that gets the facts across without being too emotional or flowery.
An addendum is an extra item that explain more about the SCP. These are optional, and you can have as many as you want. You can add experiment logs, interviews, surveillance logs, status updates, researcher's notes, and so on, even audio or visual content.
[REDACTED], [DATA EXPUNGED], blackboxes (█████, added by copying another █ and pasting it in or with alt+219 on your number pad), and other forms of censorship are used to add mystery or realism. This can backfire if you use them too gratuitously or as a way to get out of knowing what to write.
Text formatting can make your SCP document better-looking and easier to read. The text editor on every wiki page has buttons for common commands like bold, italics, underline, strikethrough, and page links. Underneath the text editor, you can find links to a Quick Reference page for basic formatting help and the full Wiki Syntax list that explains everything.
The two most frequently-asked-about formatting tools are the quote box and the collapsible.
To make a box like this, just use "> text", where "text" is whatever you want to appear on that line. Line breaks like the one after this sentence are just "> ".
Make sure to include the space, because ">text" makes that text disappear from the page.
Click here to learn about collapsing text
When in doubt, if you want to find out what the code for something is, you can go to a page that uses that something, click the "+ Options" button at the bottom of a page, then click "Page Source" to look at a page's code without editing it.
