command displays an error message and does nothing.
The undo command applies only to changes in the buffer; you can't
-use it to undo mere cursor motion. However, some cursor motion
-commands set the mark, so if you use these commands from time to time,
-you can move back to the neighborhoods you have moved through by
-popping the mark ring (@pxref{Mark Ring}).
+use it to undo mere cursor motion.
@node Basic Files
@section Files
@kindex M-=
@findex count-lines-region
- Use @kbd{M-=} (@code{count-lines-region}) to displays the number of
+ Use @kbd{M-=} (@code{count-lines-region}) to display the number of
lines in the region (@pxref{Mark}). @xref{Pages}, for the command
@kbd{C-x l} which counts the lines in the current page.