diff --git a/doc/emacs/mark.texi b/doc/emacs/mark.texi
index 10505873c53..9747d0261f6 100644
--- a/doc/emacs/mark.texi
+++ b/doc/emacs/mark.texi
@@ -444,12 +444,13 @@ from point to the end of the buffer.  Commands that act this way are
 identified in their own documentation.
 @end itemize
 
+@cindex enabling Transient Mark mode temporarily
   While Transient Mark mode is off, you can activate it temporarily
 using @kbd{C-@key{SPC} C-@key{SPC}} or @kbd{C-u C-x C-x}.
 
 @table @kbd
 @item C-@key{SPC} C-@key{SPC}
-@kindex C-SPC C-SPC@r{, disabling Transient Mark}
+@kindex C-SPC C-SPC@r{, enabling Transient Mark temporarily}
 Set the mark at point (like plain @kbd{C-@key{SPC}}) and enable
 Transient Mark mode just once, until the mark is deactivated.  (This
 is not really a separate command; you are using the @kbd{C-@key{SPC}}