--- a/doc/bash.1
+++ b/doc/bash.1
@@ -4786,6 +4786,10 @@ 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
 Redirecting input opens the file whose name results from
 the expansion of
--- a/doc/bashref.texi
+++ b/doc/bashref.texi
@@ -3388,6 +3388,9 @@ 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
 Redirecting input opens the file whose name results from
 the expansion of @var{word} for reading on file descriptor @code{n},