The character used as comment delimiter is reported in [Writing .info files (Drupal 6.x)][1]:
> info files may contain comments. The comment character is the **semi-colon** and denotes a comment at the beginning of a line. CVS Ids used to be placed at the head of info files using a semicolon, but now that Drupal.org has moved to git they are no longer included.
The equivalent book page for Drupal 7 ([Writing .info files (Drupal 7.x)][2]) reports the following sentence:
> info files may contain comments. A **semi-colon** [;] placed at the beginning of a line makes that line a comment, and that line will not be parsed.
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