Index: /u/jewillco/boost-svn/boost/dynamic_bitset/dynamic_bitset.hpp
===================================================================
--- /u/jewillco/boost-svn/boost/dynamic_bitset/dynamic_bitset.hpp	(revision 55463)
+++ /u/jewillco/boost-svn/boost/dynamic_bitset/dynamic_bitset.hpp	(working copy)
@@ -39,6 +39,7 @@
 #include "boost/static_assert.hpp"
 #include "boost/limits.hpp"
 #include "boost/pending/lowest_bit.hpp"
+#include <boost/serialization/access.hpp>
 
 
 namespace boost {
@@ -422,6 +423,11 @@
     buffer_type m_bits;
     size_type   m_num_bits;
 
+    friend class boost::serialization::access;
+    template <typename Archive>
+    void serialize(Archive& ar, const unsigned int) {
+      ar & m_bits & m_num_bits;
+    }
 
     class bit_appender;
     friend class bit_appender;