diff --git a/doc/lispref/markers.texi b/doc/lispref/markers.texi
index 28ad0ff73c0..a13edb02ae6 100644
--- a/doc/lispref/markers.texi
+++ b/doc/lispref/markers.texi
@@ -285,9 +285,10 @@ This function returns the position that @var{marker} points to, or
 
 @defun marker-last-position marker
 This function returns the last known position of @var{marker} in its
-buffer.  It behaves like @code{marker-position} with one exception: If
+buffer.  It behaves like @code{marker-position} with one exception: if
 the buffer of @var{marker} has been killed, it returns the last position
-of @var{marker} in that buffer before it was killed.
+of @var{marker} in that buffer before the buffer was killed, instead of
+returning @code{nil}.
 @end defun
 
 @defun marker-buffer marker
diff --git a/etc/NEWS b/etc/NEWS
index 8cad9412def..50f0ee4a1aa 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1817,8 +1817,9 @@ It returns the name of a buffer before the last time it was renamed or
 killed.
 
 ** New primitive 'marker-last-position'.
-It returns the last position of MARKER in its buffer even if that buffer
-has been killed.
+It returns the last position of a marker in its buffer even if that
+buffer has been killed.  ('marker-position' would return nil in that
+case.)
 
 
 ** Functions and variables to transpose sexps