runtime(doc): mention improved rendering with 'termguicolors'

related: #9715

Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 445e925c3564d05d41e7d9fe34b44af67c085c49..05da8012686e3131b3b874f5700a55d5c77a26b1 100644 (file)
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -8919,14 +8919,16 @@ A jump table for the options with a short description can be found at |Q_op|.
        When on, uses |highlight-guifg| and |highlight-guibg| attributes in
        the terminal (thus using 24-bit color).
 
-       Requires a ISO-8613-3 compatible terminal.  If setting this option
+       Requires an ISO-8613-3 compatible terminal.  If setting this option
        does not work (produces a colorless UI) reading |xterm-true-color|
        might help.
 
        For Win32 console, Windows 10 version 1703 (Creators Update) or later
        is required.  Use this check to find out: >
                if has('vcon')
-<      This requires Vim to be built with the |+vtp| feature.
+<      This requires Vim to be built with the |+vtp| feature.  Enabling
+       'termguicolors' also enable Virtual Terminal Processing (VTP) in the
+       Windows console, which improves rendering of multi-byte characters.
 
        Note that the "cterm" attributes are still used, not the "gui" ones.