Update runtime files.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index c6fc424..25b3f18 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt* For Vim version 8.0. Last change: 2017 May 08
+*options.txt* For Vim version 8.0. Last change: 2017 Jun 04
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -370,7 +370,7 @@
Setting the filetype
-:setf[iletype] {filetype} *:setf* *:setfiletype*
+:setf[iletype] [FALLBACK] {filetype} *:setf* *:setfiletype*
Set the 'filetype' option to {filetype}, but only if
not done yet in a sequence of (nested) autocommands.
This is short for: >
@@ -380,6 +380,13 @@
< This command is used in a filetype.vim file to avoid
setting the 'filetype' option twice, causing different
settings and syntax files to be loaded.
+
+ When the optional FALLBACK argument is present, a
+ later :setfiletype command will override the
+ 'filetype'. This is to used for filetype detections
+ that are just a guess. |did_filetype()| will return
+ false after this command.
+
{not in Vi}
*option-window* *optwin*
@@ -7735,6 +7742,7 @@
compatible terminal.
If setting this option does not work (produces a colorless UI)
reading |xterm-true-color| might help.
+ Note that the "cterm" attributes are still used, not the "gui" ones.
NOTE: This option is reset when 'compatible' is set.
*'terse'* *'noterse'*