This extension hook is undocumented.
Please improve the MediaWiki by adding documentation to it.
See Template:ExtensionHook for instructions on how to do it.
For examples of extensions using this hook, see Category:MyHook extensions.
Template parameters[Edit template data]
|Extension hook name
Name of the given extension hook. This isn't required as it is automatically scraped from the title, but can be overridden if need be.