This type of comment is similar to a multiline comment. The major difference is that it is used to document code within a program. A doc comment starts with a backslash followed by two asterisk characters (/**) and ends with an asterisk followed by a backslash (*/):

/**
 * Adds an [item] to the queue.
 * @return the new size of the queue.
*/
fun enqueue(item: Object): Int { ... }