Update runtime files.
diff --git a/runtime/doc/vi_diff.txt b/runtime/doc/vi_diff.txt
index 2a7bbe4..4619b50 100644
--- a/runtime/doc/vi_diff.txt
+++ b/runtime/doc/vi_diff.txt
@@ -1,4 +1,4 @@
-*vi_diff.txt* For Vim version 7.4. Last change: 2015 Nov 01
+*vi_diff.txt* For Vim version 7.4. Last change: 2016 Feb 12
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -960,7 +960,7 @@
In 2005 the POSIX test suite was run to check the compatibility of Vim. Most
of the test was executed properly. There are the few things where Vim
is not POSIX compliant, even when run in Vi compatibility mode.
-
+ *$VIM_POSIX*
Set the $VIM_POSIX environment variable to have 'cpoptions' include the POSIX
flags when Vim starts up. This makes Vim run as POSIX as it can. That's
a bit different from being Vi compatible.