Update runtime files.
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index e8fab88..429e242 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -1,4 +1,4 @@
-*usr_41.txt* For Vim version 8.1. Last change: 2019 Mar 29
+*usr_41.txt* For Vim version 8.1. Last change: 2019 Apr 06
VIM USER MANUAL - by Bram Moolenaar
@@ -775,6 +775,7 @@
systemlist() get the result of a shell command as a list
hostname() name of the system
readfile() read a file into a List of lines
+ readdir() get a List of file names in a directory
writefile() write a List of lines or Blob into a file
Date and Time: *date-functions* *time-functions*