diff --git a/doc/proot/manual.rst b/doc/proot/manual.rst
index 65dd4085..bfd19e72 100644
--- a/doc/proot/manual.rst
+++ b/doc/proot/manual.rst
@@ -532,7 +532,7 @@ are typically bound (see ``-R`` option for details).
 
 * http://distfiles.gentoo.org/releases
 
-* http://cdimage.ubuntu.com/ubuntu-core
+* http://cdimage.ubuntu.com/ubuntu-base
 
 * https://archlinuxarm.org/about/downloads