diff --git a/doc/lispref/windows.texi b/doc/lispref/windows.texi
index e070e84c67b..60baf517801 100644
--- a/doc/lispref/windows.texi
+++ b/doc/lispref/windows.texi
@@ -737,7 +737,7 @@ with any other @var{round} it returns the internal value of
 @cindex window width
 @cindex width of a window
 @cindex total width of a window
-The @dfn{total width} of a window is the number of lines comprising its
+The @dfn{total width} of a window is the number of columns comprising its
 body and its left and right decorations (@pxref{Basic Windows}).
 
 @defun window-total-width &optional window round