Runtime file updates.
diff --git a/runtime/doc/quickref.txt b/runtime/doc/quickref.txt
index 551b1ad..96c5cfb 100644
--- a/runtime/doc/quickref.txt
+++ b/runtime/doc/quickref.txt
@@ -912,6 +912,8 @@
'ttymouse' 'ttym' type of mouse codes generated
'ttyscroll' 'tsl' maximum number of lines for a scroll
'ttytype' 'tty' alias for 'term'
+'undodir' 'udir' where to store undo files
+'undofile' 'udf' save undo information in a file
'undolevels' 'ul' maximum number of changes that can be undone
'updatecount' 'uc' after this many characters flush swap file
'updatetime' 'ut' after this many milliseconds flush swap file