Editing WoW:AddOn programming tutorial/Introduction (section)

=== The .toc or Table of Contents ===
This file tells WoW about your AddOn: what files to load and what order to load them in. Later you will want to peruse the [[TOC format]] page for all of the gory details about what you could put into this file. For now we are just going to give you some basic stuff to include.

Using your trusted text file editor, place the following into the <tt>HelloWorld.toc</tt> file and save it:
 ## Interface: 30300
 ## Title: Hello, World!
 ## Notes: My first AddOn
 HelloWorld.lua
 HelloWorld.xml

See the line with ## Interface: 30300 in it? The 30300 is the TOC Version and the value shown is obsolete. You will need to put in the current value. WoW has a function, {{api|GetBuildInfo}}, which contains the current TOC Version and you can extract the number to your chat window by entering:
 <code>/run print((select(4, GetBuildInfo())));</code>
in the chat input area. See [[Getting the current interface_number]].
for other ways to get the TOC Version.

What is this number? The TOC Version is the user-interface (UI) version for the AddOn. The "30300" is version 3.03.00 (or 3.3.0). This number tells WoW that your AddOn is compatible with Blizzard UI level 3.3.0. If your TOC Version does not match the Blizzard UI number, your AddOn will be considered out of date. This is to minimize problems caused by old UI modifications hosing Blizzard's UI.

Starting from the first line we are saying:
# The compatible UI version for this addon is 30300 (or 3.3.0)
# The title of the addon to be displayed in game is "Hello, World!"
# The description of the addon to be displayed in game are the notes
# HelloWorld.lua file will be loaded.
# HelloWorld.xml file will be loaded.

For more details on stuff you can put in here, please visit the [[TOC format]] page.