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diff --git a/docs/users_guide/glasgow_exts.xml b/docs/users_guide/glasgow_exts.xml
index a193088..ddbd2ec 100644
--- a/docs/users_guide/glasgow_exts.xml
+++ b/docs/users_guide/glasgow_exts.xml
@@ -2434,7 +2434,8 @@ declarations.  Define your own instances!
 <sect2 id="gadt-style">
 <title>Declaring data types with explicit constructor signatures</title>
 
-<para>GHC allows you to declare an algebraic data type by 
+<para>When the <literal>GADTSyntax</literal> extension is enabled,
+GHC allows you to declare an algebraic data type by
 giving the type signatures of constructors explicitly.  For example:
 <programlisting>
   data Maybe a where