diff --git a/docs/formatconverter.html b/docs/formatconverter.html
index 9f72916..aef0ee2 100644
--- a/docs/formatconverter.html
+++ b/docs/formatconverter.html
@@ -53,7 +53,7 @@ RegisterConverter(MyConverter,"Q");
 </pre>
 
 <a name="theory"></a>
-<h2>Theroy of Operation</h2>
+<h2>Theory of Operation</h2>
 
 <a name="registration"></a>
 <h3>Registration </h3>