Update runtime files.
diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index dc3a23c..ff0c44a 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -1,4 +1,4 @@
-*change.txt* For Vim version 8.1. Last change: 2018 May 12
+*change.txt* For Vim version 8.1. Last change: 2018 Dec 14
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -944,9 +944,9 @@
breaks. Thus each item becomes a line, except that they can contain line
breaks themselves.
-The whole matched text can be accessed with "submatch(0)". The text matched
-with the first pair of () with "submatch(1)". Likewise for further
-sub-matches in ().
+The |submatch()| function can be used to obtain matched text. The whole
+matched text can be accessed with "submatch(0)". The text matched with the
+first pair of () with "submatch(1)". Likewise for further sub-matches in ().
Be careful: The separation character must not appear in the expression!
Consider using a character like "@" or ":". There is no problem if the result