>From 9a58ef8d720a86f14d4eaac49a25e6b27b8e1559 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Fri, 9 Nov 2018 21:27:40 -0800
Subject: [PROPOSED] * leapseconds.awk: Clarify the 1 Jan 1972 line.

---
 leapseconds.awk | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/leapseconds.awk b/leapseconds.awk
index ea0567c..242e9d6 100644
--- a/leapseconds.awk
+++ b/leapseconds.awk
@@ -24,9 +24,12 @@ BEGIN {
   print "# See: Levine J. Coordinated Universal Time and the leap second."
   print "# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995"
   print "# <https://ieeexplore.ieee.org/document/7909995>."
+  print ""
   print "# There were no leap seconds before 1972, because the official mechanism"
   print "# accounting for the discrepancy between atomic time and the earth's rotation"
-  print "# did not exist."
+  print "# did not exist.  The first (\"1 Jan 1972\") data line in leap-seconds.list"
+  print "# does not denote a leap second; it denotes the start of the current definition"
+  print"# of UTC."
   print ""
   print "# The correction (+ or -) is made at the given time, so lines"
   print "# will typically look like:"
-- 
2.17.1

