Use full path in undofile(). Updated docs.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 498df7f..63efd1c 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7265,10 +7265,11 @@
set ul=0
< But you can also get Vi compatibility by including the 'u' flag in
'cpoptions', and still be able to use CTRL-R to repeat undo.
+ Also see |undo-two-ways|.
Set to a negative number for no undo at all: >
set ul=-1
< This helps when you run out of memory for a single change.
- Also see |undo-two-ways|.
+ Also see |clear-undo|.
*'updatecount'* *'uc'*
'updatecount' 'uc' number (default: 200)