diff --git a/runtime/doc/pi_paren.txt b/runtime/doc/pi_paren.txt
index d4ab4a0..8c4f04a 100644
--- a/runtime/doc/pi_paren.txt
+++ b/runtime/doc/pi_paren.txt
@@ -57,4 +57,4 @@
 different mechanism.
 
 ==============================================================================
- vim:tw=78:ts=8:ft=help:norl:
+ vim:tw=78:ts=8:noet:ft=help:norl: