1 files changed, 6 insertions, 0 deletions

diff --git a/lispref/minibuf.texi b/lispref/minibuf.texi
index ff05572a36b..fa78ec1f8bd 100644
--- a/lispref/minibuf.texi
+++ b/lispref/minibuf.texi
@@ -613,6 +613,12 @@ commands won't exit unless the input typed is itself an element of
 @var{collection}.  If @var{require-match} is @code{nil}, the exit
 commands work regardless of the input in the minibuffer.
 
+The user can exit with null input by typing @key{RET} with an empty
+minibuffer.  Then @code{completing-read} returns @code{nil}.  This is
+how the user requests whatever default the command uses for the value
+being read.  The user can return using @key{RET} in this way regardless
+of the value of @var{require-match}.
+
 The function @code{completing-read} works by calling
 @code{read-minibuffer}.  It uses @code{minibuffer-local-completion-map}
 as the keymap if @var{require-match} is @code{nil}, and uses