diff --git a/protocol-extensions.asciidoc b/protocol-extensions.asciidoc
index 2502308c3..6ffc1cb22 100644
--- a/protocol-extensions.asciidoc
+++ b/protocol-extensions.asciidoc
@@ -28,9 +28,6 @@ in terminal editors such as vim and emacs to display red, wavy underlines under
 mis-spelled words and/or syntax errors. This is done by re-purposing some SGR escape codes
 that are not used in modern terminals (https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_codes)
 
-Setting the width and/or height to zero means that no drawing is done and the
-cursor position remains unchanged.
-
 To change the underline style from straight line to curl (this used to be the
 code for rapid blinking text, only previous use I know of was in MS-DOS ANSI.sys):