27.1.1.3 Escaping special characters in macro definitions
You can use a backslash in a macro to escape other characters, such as "\", "<", ">", """, "$", ";" and " " (space). For example, if you need to start a macro content line with "[" or ";" (left bracket or semicolon), preface the line with a backslash, to keep the line from being treated as a comment or section head:
\; This is not a configuration-file comment
; This is a configuration-file comment
To include a comment in macro definitions, see §27.1.1.5 Including comments in macro definitions.
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