diff --git a/docs/TestingGuide.html b/docs/TestingGuide.html
index 5c535f7..971e991 100644
--- a/docs/TestingGuide.html
+++ b/docs/TestingGuide.html
@@ -89,10 +89,10 @@
 </ul></dd>
 </dl>
 
-<p>Mac OS X developers can simplify installation of Expect and tcl by using
-fink.  <tt>fink install expect</tt> will install both. Alternatively, users not
-using Mac OS X an use <tt>sudo port install expect</tt> to install Expect and
-tcl.</p>
+<p>Darwin (Mac OS X) developers can simplify the installation of Expect and tcl
+by using fink.  <tt>fink install expect</tt> will install both. Alternatively,
+users not using Darwin an use <tt>sudo port install expect</tt> to install
+Expect and tcl.</p>
 
 </div>