Update runtime files.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 88dca60..a9a0cc4 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 Jan 02
+*options.txt* For Vim version 8.0. Last change: 2017 Jan 15
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -5144,7 +5144,7 @@
{not in Vi} *E21*
When off the buffer contents cannot be changed. The 'fileformat' and
'fileencoding' options also can't be changed.
- Can be reset with the |-M| command line argument.
+ Can be reset on startup with the |-M| command line argument.
*'modified'* *'mod'* *'nomodified'* *'nomod'*
'modified' 'mod' boolean (default off)
@@ -5809,6 +5809,7 @@
buffer, unless the 'Z' flag is in 'cpoptions'.
{not in Vi:} When using the ":view" command the 'readonly' option is
set for the newly edited buffer.
+ See 'modifiable' for disallowing changes to the buffer.
*'redrawtime'* *'rdt'*
'redrawtime' 'rdt' number (default 2000)