From 09c814ec2c4fa854165f98aff4d29a69cafdc92a Mon Sep 17 00:00:00 2001
From: "Malcolm.Wallace@cs.york.ac.uk" <unknown>
Date: Wed, 12 Jul 2006 09:39:07 +0000
Subject: [PATCH] document that -fglasgow-exts is needed for RULES to work

---
 docs/users_guide/glasgow_exts.xml |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/docs/users_guide/glasgow_exts.xml b/docs/users_guide/glasgow_exts.xml
index 319104e..3801f96 100644
--- a/docs/users_guide/glasgow_exts.xml
+++ b/docs/users_guide/glasgow_exts.xml
@@ -5378,7 +5378,9 @@ The programmer can specify rewrite rules as part of the source program
 (in a pragma).  GHC applies these rewrite rules wherever it can, provided (a) 
 the <option>-O</option> flag (<xref linkend="options-optimise"/>) is on, 
 and (b) the <option>-frules-off</option> flag
-(<xref linkend="options-f"/>) is not specified.
+(<xref linkend="options-f"/>) is not specified, and (c) the
+<option>-fglasgow-exts</option> (<xref linkend="options-language"/>)
+flag is active.
 </para>
 
 <para>
-- 
1.7.10.4