diff --git a/runtime/doc/os_unix.txt b/runtime/doc/os_unix.txt
index 4b69af5..5067b1e 100644
--- a/runtime/doc/os_unix.txt
+++ b/runtime/doc/os_unix.txt
@@ -57,4 +57,4 @@
 The file "tools/vim132" is a shell script that can be used to put Vim in 132
 column mode on a vt100 and lookalikes.
 
- vim:tw=78:ts=8:ft=help:norl:
+ vim:tw=78:ts=8:noet:ft=help:norl: