The following parameters that are all optional, may also be used:
type
Adds a note as to which type of template the category (but not necessarily its subcategories) is meant to contain, e.g.
{{template category|type=navbox}}
Currently, setting type to one of several values produces a preset note. The values are:
book · conversion · external link · formatting · function · infobox · meta · navbox · stub · userbox
If type is set to something other than one of these values, the default message "The pages listed in this category are meant be type templates." appears.
topic
Adds the default description "Templates relating to topic.", where topic is usually a wikilink to the book associated with the category (e.g. Algorithms for the category Category:Algorithms/Templates). See Example 1 below.
description
Use this if a customized description is needed instead of (or, if topic also used, to follow) the default description above. See Example 2 below.
{{template category
|type = navbox
|topic = China
|description = For templates relating specifically to the People's Republic of China (PRC) or the current Republic of China (ROC, "Taiwan").
}}
Templates relating to China. For templates relating specifically to the People's Republic of China (PRC) or the current Republic of China (ROC, "Taiwan").