diff --git a/src/time/format.go b/src/time/format.go
index ad5486f..cf5d6c7 100644
--- a/src/time/format.go
+++ b/src/time/format.go
@@ -1002,6 +1002,9 @@
// For layouts specifying the two-digit year 06, a value NN >= 69 will be treated
// as 19NN and a value NN < 69 will be treated as 20NN.
//
+// Timestamps representing leap seconds (second 60) cannot be parsed.
+// These are not representable by [Time].
+//
// The remainder of this comment describes the handling of time zones.
//
// In the absence of a time zone indicator, Parse returns a time in UTC.