DOCBOOK-APPS: website.xsl: typo?

Is the following a typo in the XSL-file? 
And what is it supposed to do?

--- website.xsl	Fri Nov 10 16:02:28 2000
+++ website.xsl-mw	Wed Nov 22 11:04:48 2000
@@ -547,7 +547,7 @@
         </a>
         <xsl:if test="$summary">
           <xsl:text> - </xsl:text>
-          <xsl:apply-templates select="$summary" mode="toc.mod"/>
+          <xsl:apply-templates select="$summary" mode="toc.mode"/>
         </xsl:if>
       </li>
     </xsl:otherwise>

Michael
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