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index d56ead8b..17231392 100644
--- a/doc/history.qbk
+++ b/doc/history.qbk
@@ -15,7 +15,11 @@ Currently open issues can be viewed [@https://svn.boost.org/trac/boost/query?sta
 
 All issues including closed ones can be viewed [@https://svn.boost.org/trac/boost/query?status=assigned&status=closed&status=new&status=reopened&component=regex&order=priority&col=id&col=summary&col=status&col=type&col=milestone&col=component here].
 
-[h4 Boost.Regex-5.1.0]
+[h4 Boost.Regex-5.1.1]
+
+* Change to lockfree implementation of memory cache, see [@https://github.com/boostorg/regex/pull/23 PR#23].
+
+[h4 Boost.Regex-5.1.0 (Boost-1.60.0)]
 
 * Add support for Perl's backtracking control verbs, see [@https://svn.boost.org/trac/boost/ticket/11205 #11205].  Note however, that
 (*MARK) and operations on marks are not currently supported.
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index 599ee187..f54c918c 100644
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diff --git a/doc/html/boost_regex/background_information/futher.html b/doc/html/boost_regex/background_information/futher.html
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-<td align="left"><p><small>Last revised: October 15, 2015 at 17:25:24 GMT</small></p></td>
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