diff --git a/doc/source/_vendor/vendor_strings.txt b/doc/source/_vendor/vendor_strings.txt
index 577da9c49..9833b7ec3 100755
--- a/doc/source/_vendor/vendor_strings.txt
+++ b/doc/source/_vendor/vendor_strings.txt
@@ -77,4 +77,6 @@
 .. |OVS-DPDK| replace:: |OVS|-|DPDK|
 .. |ovs-dpdk| replace:: ovs-dpdk
 
-.. |vswitch-label| replace:: openvswitch=enabled
\ No newline at end of file
+.. |vswitch-label| replace:: openvswitch=enabled
+
+.. |registry-url| replace:: https://hub.docker.com/layers
\ No newline at end of file