diff --git a/sgml/catalog b/sgml/catalog
new file mode 100644
index 0000000000..a71a6b9665
--- /dev/null
+++ b/sgml/catalog
@@ -0,0 +1,4 @@
+-- Catalog file for FreeBSD Extended DocBook DTD --
+
+PUBLIC "-//FreeBSD//DTD DocBook V3.0-Based Extension//EN" "freebsd.dtd"
+