diff --git a/doc/xml.html b/doc/xml.html
index 7930429..bf6f483 100644
--- a/doc/xml.html
+++ b/doc/xml.html
@@ -3314,7 +3314,7 @@
     directory, it will set-up /etc/xml/catalog and /etc/xml/docbook based on
     the resources found on the system. Otherwise it will just create
     ~/xmlcatalog and ~/dbkxmlcatalog and doing:
-    <p><code>export XMLCATALOG=$HOME/xmlcatalog</code></p>
+    <p><code>export XML_CATALOG_FILES=$HOME/xmlcatalog</code></p>
     <p>should allow to process DocBook documentations without requiring
     network accesses for the DTD or stylesheets</p>
   </li>