From 3e7424dff502a42081408cde0b4ca7befc8bbd0a Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Fri, 22 Apr 2016 00:17:53 -0400
Subject: [PATCH] helper: Described what overallRangeFromIntervals does

---
 src/helper.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/helper.cpp b/src/helper.cpp
index fbb4e4e6..7ebaba61 100644
--- a/src/helper.cpp
+++ b/src/helper.cpp
@@ -460,6 +460,8 @@ std::vector <Daterange> subtractRanges (
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// From a set of intervals, find the earliest start and the latest end, and
+// return these in a Daterange.
 Daterange overallRangeFromIntervals (const std::vector <Interval>& intervals)
 {
   Daterange overall;