diff --git a/Contrib/nsDialogs/Readme.html b/Contrib/nsDialogs/Readme.html
index a02ac835..b61a369e 100644
--- a/Contrib/nsDialogs/Readme.html
+++ b/Contrib/nsDialogs/Readme.html
@@ -621,7 +621,7 @@ SectionEnd</pre></blockquote>
 
 <h3><a name="mref-onback"></a>NSD_OnBack</h3>
 
-<p><code>${NSD_OnBack} <i>control_HWND</i> <i>function_address</i></code></p>
+<p><code>${NSD_OnBack} <i>function_address</i></code></p>
 
 <p>See <a href="#ref-onback">OnBack</a> for more details.</p>