diff --git a/share/sgml/urls.ent b/share/sgml/urls.ent
index 53e4cce736..2c813fa78c 100644
--- a/share/sgml/urls.ent
+++ b/share/sgml/urls.ent
@@ -42,6 +42,9 @@
 ]]>
 <!ENTITY url.base "&url.relprefix;">
 
+<!-- XXX: This will be removed soon -->
+<!ENTITY url.main "&url.base;">
+
 <!ENTITY doc.langcode.en      "en_US.ISO8859-1">
 <!ENTITY doc.langcode.default "en_US.ISO8859-1">
 <!ENTITY doc.langcode         "&doc.langcode.default;">