diff --git a/sgml/catalog b/sgml/catalog
index 2380bc6..0bd2004 100644
--- a/sgml/catalog
+++ b/sgml/catalog
@@ -6,3 +6,4 @@ CATALOG "/etc/sgml/sgml-ent.cat"
 CATALOG "/etc/sgml/xml-docbook-4.1.2.cat"
 CATALOG "/etc/sgml/xml-docbook-4.3.cat"
 CATALOG "/etc/sgml/dsssl-docbook-stylesheets.cat"
+CATALOG "/etc/sgml/sgml-docbook-3.1.cat"
diff --git a/sgml/sgml-docbook-3.1.cat b/sgml/sgml-docbook-3.1.cat
new file mode 100644
index 0000000..f0ea203
--- /dev/null
+++ b/sgml/sgml-docbook-3.1.cat
@@ -0,0 +1,2 @@
+CATALOG "/usr/share/sgml/docbook/sgml-dtd-3.1/catalog"
+CATALOG "/etc/sgml/sgml-docbook.cat"