Added docstring.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2015-07-21 07:18:00
Author local date 2015-07-21 09:18:00 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2015-07-21 07:18:00
Committer local date 2015-07-21 09:18:00 +0200
Commit 5380c7b58bec0f82ee23ddf7d42cc564447ff780
Tree 282b03217e71b8ad60614326b4cd3272a34d4e34
Parent 5227ddd96276b85436dc56e70c9e4c35b599d064
Added docstring.
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