diff --git a/lispref/minibuf.texi b/lispref/minibuf.texi
index 58ffd6d1a93..bfc5989942d 100644
--- a/lispref/minibuf.texi
+++ b/lispref/minibuf.texi
@@ -1631,3 +1631,9 @@ that is non-@code{nil}, then the command can use the minibuffer to read
 arguments even if it is invoked from the minibuffer.  The minibuffer
 command @code{next-matching-history-element} (normally @kbd{M-s} in the
 minibuffer) uses this feature.
+
+@defun minibuffer-message string &optional timeout
+This function displays @var{string} temporarily at the end of the
+minibuffer text, for @var{timeout} seconds.  (The default is 2
+seconds.)
+@end defun