diff --git a/bin/sleep/sleep.1 b/bin/sleep/sleep.1
--- a/bin/sleep/sleep.1
+++ b/bin/sleep/sleep.1
@@ -32,7 +32,7 @@
 .\"	@(#)sleep.1	8.3 (Berkeley) 4/18/94
 .\" $FreeBSD$
 .\"
-.Dd April 18, 1994
+.Dd December 31, 2020
 .Dt SLEEP 1
 .Os
 .Sh NAME
@@ -65,8 +65,8 @@
 command allows and honors a non-integer number of seconds to sleep
 in any form acceptable by
 .Xr strtod 3 .
-This is a non-portable extension, and its use will nearly guarantee that
-a shell script will not execute properly on another system.
+This is a non-portable extension, but is also implemented in GNU sh-utils
+since version 2.0a (released in 2002).
 .Sh EXIT STATUS
 .Ex -std
 .Sh EXAMPLES