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Comments are a way of inserting text into UnrealScript code to remind yourself of what the code is doing, or to give a summary of the code file. Comments will be ignored by the compiler, so they can also be used to temporarily 'disable' a line of text.

UnrealScript supports two kind of comments a single comment and a multiple line comment.
single line comments are used like this

// The commented declaration would also make the compiler ignore the declaration therefor it can be useful to disable declarations 
// for various reasons such as testing and debugging.
//var int TestVar;

and multiple line comments are used like this.

 * NOTE: Never change the value of this variable to -1! the class functions always expect it to be a positive-only value!.
var int TestVar;

Because the UnrealScript language commenting style is very similar to other programming languages commenting styles, the following link might be useful wp:Comment_(computer_programming).

Most of the core functionality is documented by Epic using the wp:Javadoc style of commenting files, you can however comment in any fashion you like, these are simply commenting guidelines which have become a standard that people use. It allows unified documentation of source across many languages, in this case c-type languages. As an example of an alternative one might use is C Sharp XML comments which is similar to javadocs but instead uses xml.

Acouple of notes is that multi line comments typically go as such:

/* anything in here is a comment

with no following *'s

/** this is useful technical information

is a common style used for function definition commentary.

/// single line useful information

The triple '/' is also used some in place of the double '/', in unrealscript however most of the useful single line commentary is documented using multi line comments as shown in the first example.