diff --git a/doc/optional.html b/doc/optional.html
index 895312d..8143319 100644
--- a/doc/optional.html
+++ b/doc/optional.html
@@ -127,7 +127,7 @@ undefined behavior</i>
   which in our case is either <code>T</code> or <code>nil_t</code>.<br>
   Using the <a href="../../../doc/html/variant.html">Boost.Variant</a> library, this model can be implemented
   in terms of <code>boost::variant&lt;T,nil_t&gt;</code>.<br>
-  There is precedence for a discriminated union as a model for an optional value: the
+  There is precedent for a discriminated union as a model for an optional value: the
   <a href="http://www.haskell.org/"><u>Haskell</u></a> <b>Maybe</b> built-in type constructor. 
 Thus, a discriminated union <code>T+nil_t</code> serves as a conceptual foundation.</p>
 <p>A <code>variant&lt;T,nil_t&gt;</code> follows naturally from the traditional idiom of extending
@@ -1611,4 +1611,4 @@ the latest version of this file can be found at <A
 HREF="http://www.boost.org">www.boost.org</A>, and the boost
 <A HREF="http://www.boost.org/more/mailing_lists.htm#main">discussion lists</A></P>
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