diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index a7772a034..0d3771b6c 100644
--- a/doc/Guidebook.tex
+++ b/doc/Guidebook.tex
@@ -4346,7 +4346,7 @@ Cannot be set with the `{\tt O}' command.
 Set the VGA mode resolution height (MS-DOS only, with video:vga)
 %.lp
 \item[\ib{video\verb+_+width}]
-Set the VGA mode resolution height (MS-DOS only, with video:vga)
+Set the VGA mode resolution width (MS-DOS only, with video:vga)
 %.lp
 \item[\ib{videocolors}]
 \begin{sloppypar}