Add link to asio wiki.

asio/src/doc/using.qbk

diff --git a/asio/src/doc/using.qbk b/asio/src/doc/using.qbk
index aa82271..cef64b2 100644
--- a/asio/src/doc/using.qbk
+++ b/asio/src/doc/using.qbk
@@ -278,4 +278,9 @@
 access is provided via [@http://dir.gmane.org/gmane.comp.lib.boost.asio.user
 Gmane].
 
+[heading Wiki]
+
+Users are encouraged to share examples, tips and FAQs on the Asio wiki,
+which is located at [@http://asio.sourceforge.net].
+
 [endsect]