Update runtime files
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 0b35e94..9141763 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -799,7 +799,8 @@
When on, Vim will change the current working directory whenever you
open a file, switch buffers, delete a buffer or open/close a window.
It will change to the directory containing the file which was opened
- or selected.
+ or selected. When a buffer has no name it also has no directory, thus
+ the current directory won't change when navigating to it.
Note: When this option is on some plugins may not work.
*'autoshelldir'* *'asd'* *'noautoshelldir'* *'noasd'*