diff --git a/string/doc/Jamfile.v2 b/string/doc/Jamfile.v2
index ac3a43b..7bcc43e 100644
--- a/string/doc/Jamfile.v2
+++ b/string/doc/Jamfile.v2
@@ -10,7 +10,10 @@
 import toolset ;
 toolset.using doxygen ;
 
-boostbook string_algo : string_algo.xml autodoc ;
+boostbook string_algo : string_algo.xml autodoc 
+	:
+        <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/doc/html
+	;
 
 doxygen autodoc
     :