diff --git a/docs/windows.txt b/docs/windows.txt
index b8db4f6754b..a5fb7eb7220 100644
--- a/docs/windows.txt
+++ b/docs/windows.txt
@@ -193,15 +193,6 @@ DirectDraw-specific options
 Direct3D-specific options
 -------------------------
 
--d3dversion <version>
-
-	MAME supports both Direct3D 9 and Direct3D 8 for maximum compatibility.
-	By default, it will automatically detect which one it can use and use
-	that version exclusively. You can override MAME's selection with this
-	option. It is primarily intended as a means for the MAME developers to
-	test compatibility with older hardware; for the most part, there is no
-	reason to alter this setting. The default is 9.
-
 -[no]filter / -[no]d3dfilter / -[no]flt
 
 	Enable bilinear filtering on the game screen graphics. When disabled,