diff --git a/gui-doc/scribblings/gui/win-overview.scrbl b/gui-doc/scribblings/gui/win-overview.scrbl
index c09be7c8e..709f365de 100644
--- a/gui-doc/scribblings/gui/win-overview.scrbl
+++ b/gui-doc/scribblings/gui/win-overview.scrbl
@@ -1039,7 +1039,7 @@ sequence.
 
 @section[#:tag "display-resolution"]{Screen Resolution and Text Scaling}
 
-On Mac OS, screen sizes are described to users in terms of drawing
+On macOS, screen sizes are described to users in terms of drawing
 units. A Retina display provides two pixels per drawing unit, while
 drawing units are used consistently for window sizes, child window
 positions, and canvas drawing. A ``point'' for font sizing is