diff --git a/databases/cdb/pkg-descr b/databases/cdb/pkg-descr
index cb85d98f4ab1..7f59c7bb6568 100644
--- a/databases/cdb/pkg-descr
+++ b/databases/cdb/pkg-descr
@@ -20,3 +20,5 @@ cdbmake-compatible format.
 cdb is designed to be used in mission-critical applications like e-mail.
 Database replacement is safe against system crashes. Readers don't have
 to pause during a rewrite.
+
+ftp://koobera.math.uic.edu/www/cdb.html