Index: bin/sleep/sleep.1
===================================================================
--- bin/sleep/sleep.1
+++ bin/sleep/sleep.1
@@ -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