diff --git a/doc/interprocess.qbk b/doc/interprocess.qbk
index e3080e1..9f97bf2 100644
--- a/doc/interprocess.qbk
+++ b/doc/interprocess.qbk
@@ -6722,6 +6722,7 @@ thank them:
               [@https://svn.boost.org/trac/boost/ticket/7923 #7923],
               [@https://svn.boost.org/trac/boost/ticket/7924 #7924],
               [@https://svn.boost.org/trac/boost/ticket/7928 #7928].
+              [@https://svn.boost.org/trac/boost/ticket/8521 #8521].
 
 [endsect]