From 6ecb89fe88573fe16b2ae4c4c43d11b20ac4492e Mon Sep 17 00:00:00 2001
From: Austin Seipp <austin@well-typed.com>
Date: Mon, 7 Apr 2014 10:15:05 -0500
Subject: [PATCH] users_guide: note -XPatternSynonyms is required for use sites

Signed-off-by: Austin Seipp <austin@well-typed.com>
(cherry picked from commit b059dcc81e9c4097b5f04f85e1ac33586c494110)
---
 docs/users_guide/glasgow_exts.xml | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/docs/users_guide/glasgow_exts.xml b/docs/users_guide/glasgow_exts.xml
index cd798ca26389..f56bb892ae3f 100644
--- a/docs/users_guide/glasgow_exts.xml
+++ b/docs/users_guide/glasgow_exts.xml
@@ -856,9 +856,11 @@ y)</literal> will not be coalesced.
 </title>
 
 <para>
-Pattern synonyms are enabled by the flag <literal>-XPatternSynonyms</literal>.
-More information and examples of view patterns can be found on the
-<ulink url="http://ghc.haskell.org/trac/ghc/wiki/PatternSynonyms">Wiki
+Pattern synonyms are enabled by the flag
+<literal>-XPatternSynonyms</literal>, which is required for both
+defining them <emphasis>and</emphasis> using them.  More information
+and examples of view patterns can be found on the <ulink
+url="http://ghc.haskell.org/trac/ghc/wiki/PatternSynonyms">Wiki
 page</ulink>.
 </para>
 
-- 
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