Add doc comment

[zingimmick]

Fixes #96, fixes #97.

[deepsource-io]

Here's the code health analysis summary for commits 6a50334..7526d76. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
PHP	✅ Success	🎯 3 occurences resolved	View Check ↗

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.28%. Comparing base (6a50334) to head (4b248a9).

❗ Current head 4b248a9 differs from pull request most recent head 7526d76. Consider uploading reports for the commit 7526d76 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #95   +/-   ##
=========================================
  Coverage     94.28%   94.28%           
  Complexity       14       14           
=========================================
  Files             2        2           
  Lines            70       70           
=========================================
  Hits             66       66           
  Misses            4        4           

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