diff --git a/docs/manual.rst b/docs/manual.rst
index 090d9775c..38d8b1f96 100755
--- a/docs/manual.rst
+++ b/docs/manual.rst
@@ -2317,7 +2317,7 @@ for example. For more information, see the `Boost.Filesystem docs`__.
 __ http://www.boost.org/libs/filesystem/doc/index.htm
 
 
-aknowledgements
+acknowledgements
 ===============
 
 Written by Arvid Norberg. Copyright (c) 2003