Documentation Comment Editing
The Template Editor makes it easy to document your template code. The documentation you write shows up in statement completion and quick info, so you can see what a method, property or argument does without reading its code.
Adding a documentation comment
To add a documentation comment, type /// (C#) or ''' (Visual Basic) on the line immediately before a type or member. The editor inserts a stub with the right tags for you.
As you press Enter inside a documentation comment, the editor adds /// or ''' to the next line so you can keep typing.
Example
Suppose you're working on an existing template and come across a WriteToLog<T> method. You don't know what it does, so you point at it to see its quick info. It has no documentation, so quick info shows only its signature.

You use Go To Definition to read the method, and then document it for the next person:
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Place the cursor on the empty line above the method.

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Type
///. The editor inserts a documentation stub withsummary,typeparamandparamtags.
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Fill in the summary.
Now, when you point at WriteToLog<T>, quick info shows your description.
