diff --git a/using_concept_check.htm b/using_concept_check.htm
index ba75282..2d08db2 100644
--- a/using_concept_check.htm
+++ b/using_concept_check.htm
@@ -32,7 +32,7 @@
   complete list. In addition, other boost libraries come with concept
   checking classes for the concepts that are particular to those libraries.
   For example, there are <a href="../graph/doc/graph_concepts.html">graph
-  concepts</a> and <a href="../property_map/property_map.html">property map
+  concepts</a> and <a href="../property_map/doc/property_map.html">property map
   concepts</a>. Also, whenever <b>anyone</b> writing function templates needs
   to express requirements that are not yet stated by an existing concept, a
   new concept checking class should be created. How to do this is explained
@@ -136,7 +136,7 @@ BOOST_CONCEPT_REQUIRES(
   corresponding concept checking class will have multiple template
   parameters. The following example shows how <tt>BOOST_CONCEPT_REQUIRES</tt>
   is used with the <a href=
-  "../property_map/ReadWritePropertyMap.html">ReadWritePropertyMap</a>
+  "../property_map/doc/ReadWritePropertyMap.html">ReadWritePropertyMap</a>
   concept, which takes two type parameters: a property map and the key type
   for the map.</p>
   <pre>