diff --git a/doc/hash_equality.qbk b/doc/hash_equality.qbk
index 11111050..dcfb1519 100644
--- a/doc/hash_equality.qbk
+++ b/doc/hash_equality.qbk
@@ -45,14 +45,14 @@ Similarly, a custom hash function can be used for custom types:
 [import src_code/point1.cpp]
 [point_example1]
 
-Although, customizing Boost.Hash is probably a better solution:
+Although, customizing [link hash Boost.Hash] is probably a better solution:
 
 [import src_code/point2.cpp]
 [point_example2]
 
-See the Boost.Hash documentation for more detail on how to do this. Remember
-that it relies on extensions to the draft standard - so it won't work on other
-implementations of the unordered associative containers.
+See the [link hash Boost.Hash] documentation for more detail on how to do this.
+Remember that it relies on extensions to the draft standard - so it won't work
+on other implementations of the unordered associative containers.
 
 [table Methods for accessing the hash and equality functions.
     [[Method] [Description]]
diff --git a/doc/intro.qbk b/doc/intro.qbk
index bb9fa305..fcc1dd18 100644
--- a/doc/intro.qbk
+++ b/doc/intro.qbk
@@ -111,6 +111,16 @@ can be in any order. For example, it might be:
     three,3
     missing,0
 
+To store an object in an unordered associative container requires both an
+key equality function and a hash function. The default function objects in
+the standard containers support integer types, floating point types, pointer
+types, the standard strings and std::error_code. Since Boost.Unordered uses
+[classref boost::hash] it also supports the standard containers and any types
+customized for [link hash Boost.Hash]. You can also use your custom equality
+predicates and hash functions. See the
+[link unordered.hash_equality Equality Predicates and Hash Functions] section
+for more details.
+
 There are other differences, which are listed in the
 [link unordered.comparison Comparison with Associative Containers] section.