patch 7.4.1770
Problem:    Cannot use true color in the terminal.
Solution:   Add the 'guicolors' option. (Nikolai Pavlov)
diff --git a/runtime/doc/various.txt b/runtime/doc/various.txt
index 8e51005..b73949f 100644
--- a/runtime/doc/various.txt
+++ b/runtime/doc/various.txt
@@ -424,6 +424,7 @@
 m  *+tcl/dyn*		Tcl interface |tcl-dynamic| |/dyn|
    *+terminfo*		uses |terminfo| instead of termcap
 N  *+termresponse*	support for |t_RV| and |v:termresponse|
+m  *+termtruecolor*	24-bit color in xterm-compatible terminals support
 N  *+textobjects*	|text-objects| selection
    *+tgetent*		non-Unix only: able to use external termcap
 N  *+timers*		the |timer_start()| function