<p>The <directive type="section" module="core">IfDefine</directive> directive
encloses directives that will only be applied if an appropriate
-parameter is defined on the <program>httpd</program> command line. For example,
+parameter is defined on the <program>httpd</program> command line,
+or with a <directive module="core">Define</directive> directive. For example,
with the following configuration, all requests will be redirected
to another site only if the server is started using
<code>httpd -DClosedForNow</code>:</p>