diff --git a/runtime/doc/testing.txt b/runtime/doc/testing.txt
index 0459aa3..2811568 100644
--- a/runtime/doc/testing.txt
+++ b/runtime/doc/testing.txt
@@ -208,6 +208,8 @@
 		ui_delay     time in msec to use in ui_delay(); overrules a
 			     wait time of up to 3 seconds for messages
 		uptime 	     overrules sysinfo.uptime
+		vterm_title  setting the window title by a job running in a
+			     terminal window
 		ALL	     clear all overrides ({val} is not used)
 
 		"starting" is to be used when a test should behave like