diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index a31ae3d..949ff83 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7437,6 +7437,7 @@
 	or "xterm2" already.  The main use of this option is to set it to
 	"xterm", when the terminal name doesn't start with "xterm", but it can
 	handle xterm mouse codes.
+	The "sgr" value will be set if the xterm version is 277 or later.
 	The "xterm2" value will be set if the xterm version is reported to be
 	95 or higher.  This only works when compiled with the |+termresponse|
 	feature and if |t_RV| is set to the escape sequence to request the