@kindex M-mouse-1
@item M-mouse-1
Set one endpoint for the @dfn{secondary selection}
-(@code{mouse-start-secondary}). Use @kbd{M-mouse-3} to set the other
-end and complete the selection. This command can also cancel any
-existing secondary selection without starting a new one, if you click
-@kbd{M-mouse-1} on the mode line or on the header line.
+(@code{mouse-start-secondary}); use @kbd{M-mouse-3} to set the other
+end and complete the selection. This command cancels any existing
+secondary selection, when it starts a new one.
@findex mouse-secondary-save-then-kill
@kindex M-mouse-3