diff --git a/doc/portability.qbk b/doc/portability.qbk
index 66f909a..0e89196 100644
--- a/doc/portability.qbk
+++ b/doc/portability.qbk
@@ -10,7 +10,7 @@
 __boost_hash__ is written to be as portable as possible, but unfortunately, several
 older compilers don't support argument dependent lookup (ADL) - the mechanism
 used for customisation.  On those compilers custom overloads for `hash_value`
-need to be declared in the boost namespace.
+needs to be declared in the boost namespace.
 
 On a strictly standards compliant compiler, an overload defined in the
 boost namespace won't be found when __boost_hash__ is instantiated,
diff --git a/doc/ref.xml b/doc/ref.xml
index 0ce8318..21acd4a 100644
--- a/doc/ref.xml
+++ b/doc/ref.xml
@@ -406,8 +406,6 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
         </method>
       </struct-specialization>
 
-      <free-function-group name="Support functions (Boost extension).">
-
       <!--
         boost::hash_combine
         -->
@@ -502,10 +500,6 @@ for(; first != last; ++first)
         </para></throws>
       </overloaded-function>
 
-      </free-function-group>
-
-      <free-function-group name="Overloadable hash implementation (Boost extension).">
-
       <!--
         boost::hash_value - integers
         -->
@@ -803,7 +797,6 @@ return seed;</programlisting></entry>
           </informaltable>
         </returns>
       </overloaded-function>
-      </free-function-group>
     </namespace>
   </header>
 </library-reference>