diff --git a/tools/autogenerate-config-flagmappings/README.md b/tools/autogenerate-config-flagmappings/README.md
index 36f67bdcc2..bdc9663f2d 100644
--- a/tools/autogenerate-config-flagmappings/README.md
+++ b/tools/autogenerate-config-flagmappings/README.md
@@ -5,4 +5,4 @@ Automatically generate configuration tables to document OpenStack.
 
 This tool is now available and documented in the `openstack-doc-tools`
 repository:
-http://git.openstack.org/cgit/openstack/openstack-doc-tools/plain/autogenerate_config_docs/README.md
+http://git.openstack.org/cgit/openstack/openstack-doc-tools/plain/autogenerate_config_docs/README.rst