From bf5b0070c12f39749e256bf1c9f16198001c7a40 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 8 Feb 2018 10:29:37 +0530
Subject: [PATCH] Add note about terminfo property used for styled underlines

---
 protocol-extensions.asciidoc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/protocol-extensions.asciidoc b/protocol-extensions.asciidoc
index a7b4b2893..bd098fc16 100644
--- a/protocol-extensions.asciidoc
+++ b/protocol-extensions.asciidoc
@@ -54,6 +54,8 @@ To reset the underline color (also previously reserved and unused):
 <ESC>[59m
 ```
 
+To detect support for this feature in a terminal emulator, query the terminfo database
+for the `Su` boolean capability.
 
 == Graphics rendering