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-rw-r--r--share/zoneinfo/datfiles/leapseconds7
1 files changed, 5 insertions, 2 deletions
diff --git a/share/zoneinfo/datfiles/leapseconds b/share/zoneinfo/datfiles/leapseconds
index e792e0fa051..84b073d69d9 100644
--- a/share/zoneinfo/datfiles/leapseconds
+++ b/share/zoneinfo/datfiles/leapseconds
@@ -1,4 +1,4 @@
-# $OpenBSD: leapseconds,v 1.37 2018/10/22 21:44:28 millert Exp $
+# $OpenBSD: leapseconds,v 1.38 2019/01/01 13:22:16 millert Exp $
# Allowance for leap seconds added to each time zone file.
# This file is in the public domain.
@@ -20,9 +20,12 @@
# See: Levine J. Coordinated Universal Time and the leap second.
# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
# <https://ieeexplore.ieee.org/document/7909995>.
+
# There were no leap seconds before 1972, because the official mechanism
# accounting for the discrepancy between atomic time and the earth's rotation
-# did not exist.
+# did not exist. The first ("1 Jan 1972") data line in leap-seconds.list
+# does not denote a leap second; it denotes the start of the current definition
+# of UTC.
# The correction (+ or -) is made at the given time, so lines
# will typically look like: