Please describe the problem:
Objective C Extensions are like anonymous categories, in that they declare additional methods that are part of the class implementation. Unlike categories, the methods declared in the extensions must be implemented as a part of the class.

Extensions are written as follows:

@interface ClassName ()
// Method declarations here
@end

This differs from the Category format, where a category name would be included between the parenthesis.

There is no \extension command, so I attempted to use the \category command to document my extensions. Building the documentation resulted in the following error:

Warning: missing argument after \category

It appears that empty parenthesis are not allowed in the category tag.

Steps to reproduce:
1. 
2. 
3. 


Actual results:


Expected results:


Does this happen every time?


Other information:
I suppose the could be rendered moot if #525147 is implemented.