src/time/format.go | 3 +++

diff --git a/src/time/format.go b/src/time/format.go
index ad5486f4d28f8930b37b01ec6e0957302395956e..cf5d6c712dba0628d88887c2882c3c15776ddf11 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.