Add a little bit of commentary on ArcTool, a=chris

Author Chris Pollett <chris@pollett.org>
Author date 2015-10-27 05:Oct:th
Author local date 2015-10-26 22:Oct:th -0700
Committer Chris Pollett <chris@pollett.org>
Committer date 2015-10-27 05:Oct:th
Committer local date 2015-10-26 22:Oct:th -0700
Commit 45597afdbe018d74a453e4c47dab2cad82c8751f
Tree 8e3e7dd8ef250941809fdd60f8fd49d09ce0ba73
Parent c4b6913a5059beb30df65f5fbef445679548a4cd
Add a little bit of commentary on ArcTool, a=chris
Affected files:
src/executables/ArcTool.php
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