diff --git a/doc/Jamfile.v2 b/doc/Jamfile.v2
index 7b00065..f69d0b5 100644
--- a/doc/Jamfile.v2
+++ b/doc/Jamfile.v2
@@ -1,4 +1,7 @@
 project boost/concepts ;
 import boostbook : boostbook ;
 
-boostbook concepts : reference/concepts.xml ;
+boostbook concepts : reference/concepts.xml 
+	:
+        <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/doc/html
+	;