diff --git a/preface.asciidoc b/preface.asciidoc
index 5f5d0b3f..5dd75206 100644
--- a/preface.asciidoc
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@@ -116,9 +116,6 @@ Follow us on Twitter: link:$$http://twitter.com/oreillymedia$$[]
 
 Watch us on YouTube: link:$$http://www.youtube.com/oreillymedia$$[]
 
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 === Acknowledgments