Update runtime files
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index ffc5d1f..5959de3 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -1,4 +1,4 @@
-*todo.txt* For Vim version 8.2. Last change: 2021 Sep 20
+*todo.txt* For Vim version 8.2. Last change: 2021 Sep 22
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -429,6 +429,9 @@
After recovering from a swap file the undofile should not be used, it causes
corruption. (#6631)
+When the computer crashes while writing the undofile, the contents may be
+lost. Write to a temp file, fsync and rename. (#8879)
+
When 'lazyredraw' is set sometimes the title is not updated.
(Jason Franklin, 2020 Feb 3) Looks like a race condition.