Index: b/doc/bash.1
===================================================================
--- a/doc/bash.1
+++ b/doc/bash.1
@@ -3914,6 +3914,10 @@ A failure to open or create a file cause
 Redirections using file descriptors greater than 9 should be used with
 care, as they may conflict with file descriptors the shell uses
 internally.
+.PP
+Note that the
+.B exec
+builtin command can make redirections take effect in the current shell.
 .SS Redirecting Input
 .PP
 Redirection of input causes the file whose name results from
Index: b/doc/bashref.texi
===================================================================
--- a/doc/bashref.texi
+++ b/doc/bashref.texi
@@ -2743,6 +2743,9 @@ Redirections using file descriptors grea
 care, as they may conflict with file descriptors the shell uses
 internally.
 
+Note that the @code{exec} builtin command can make redirections take
+effect in the current shell.
+
 @subsection Redirecting Input
 Redirection of input causes the file whose name results from
 the expansion of @var{word}