diff --git a/doc/strong_typedef.html b/doc/strong_typedef.html
index 391d7d1d2..9ad9ceeb0 100644
--- a/doc/strong_typedef.html
+++ b/doc/strong_typedef.html
@@ -76,7 +76,7 @@ <h3>Usage</h3>
 will create a new type "name" which will be substitutable for the original
 type but still of distinct type.
 
-<h3>Implemenation</h3>
+<h3>Implementation</h3>
 <code style="white-space: normal">BOOST_STRONG_TYPEDEF</code> is a macro
 which generates a class named "name" which wraps an instance of its
 primitive type and provides appropriate conversion operators in order