commit bash-20160715 snapshot

doc/bashref.texi

@@ -2592,7 +2592,10 @@ because the standard error was made a copy of the standard output
 before the standard output was redirected to @var{dirlist}.
 
 Bash handles several filenames specially when they are used in
-redirections, as described in the following table:
+redirections, as described in the following table.
+If the operating system on which Bash is running provides these
+special files, bash will use them; otherwise it will emulate them
+internally with the behavior described below.
 
 @table @code
 @item /dev/fd/@var{fd}