Update runtime files
diff --git a/runtime/doc/arabic.txt b/runtime/doc/arabic.txt
index d1a92df..28e2038 100644
--- a/runtime/doc/arabic.txt
+++ b/runtime/doc/arabic.txt
@@ -1,4 +1,4 @@
-*arabic.txt* For Vim version 8.2. Last change: 2019 May 05
+*arabic.txt* For Vim version 8.2. Last change: 2021 Jun 22
VIM REFERENCE MANUAL by Nadim Shaikli
@@ -176,6 +176,13 @@
and its support is preferred due to its level of offerings.
'arabic' when 'termbidi' is enabled only sets the keymap.
+ For vertical window isolation while setting 'termbidi' an LTR
+ vertical separator like "l" or "𝖨" may be used. It may also be
+ hidden by changing its color to the foreground color: >
+ :set fillchars=vert:l
+ :hi VertSplit ctermbg=White
+< Note that this is a workaround, not a proper solution.
+
If, on the other hand, you'd like to be verbose and explicit and
are opting not to use the 'arabic' short-cut command, here's what
is needed (i.e. if you use ':set arabic' you can skip this section) -