More runtime file fixes for 'compatible' mode.
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index be31f44..91ee7f4 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt* For Vim version 7.3. Last change: 2012 Apr 25
+*eval.txt* For Vim version 7.3. Last change: 2012 Apr 30
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -5964,6 +5964,8 @@
the undo file exists.
{name} is always expanded to the full path, since that is what
is used internally.
+ If {name} is empty undofile() returns an empty string, since a
+ buffer without a file name will not write an undo file.
Useful in combination with |:wundo| and |:rundo|.
When compiled without the +persistent_undo option this always
returns an empty string.