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-rw-r--r--leapseconds5
1 files changed, 4 insertions, 1 deletions
diff --git a/leapseconds b/leapseconds
index 148aa8ee3ef5b..325f3a1d13832 100644
--- a/leapseconds
+++ b/leapseconds
@@ -19,9 +19,12 @@
# 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: