diff --git a/doc/intro.qbk b/doc/intro.qbk
index d91c729..1c82f74 100644
--- a/doc/intro.qbk
+++ b/doc/intro.qbk
@@ -11,6 +11,7 @@
 [def __tr1__
     [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf
     TR1]]
+[def __unordered__ [link unordered Boost.Unordered]]
 [def __intrusive__ [link intrusive.unordered_set_unordered_multiset Boost.Intrusive]]
 [def __multi-index__ [@../../libs/multi_index/doc/index.html
     Boost Multi-Index Containers Library]]
@@ -26,7 +27,7 @@
 
 [classref boost::hash] is an implementation of the __hash-function__ object
 specified by the __tr1-full__ (TR1). It is the default hash function for
-__intrusive__'s unordered associative containers, and
+__unordered__, __intrusive__'s unordered associative containers, and
 __multi-index-short__'s hash indicies and __bimap__'s `unordered_set_of`.
 
 As it is compliant with __tr1__, it will work with: