cleaned up inventory file

README-INVENTORY-FILE.md

diff --git a/README-INVENTORY-FILE.md b/README-INVENTORY-FILE.md
index b7747d1..a28bf44 100644
--- a/README-INVENTORY-FILE.md
+++ b/README-INVENTORY-FILE.md
@@ -17,7 +17,7 @@
 These roles depend on use of conventions in the inventory file. 
 Specifically inventory file conventions are [Ansible group](http://docs.ansible.com/ansible/latest/user_guide/intro_inventory.html#hosts-and-groups) names that
 are defined around Apigee semantics. These Ansible groups are 
-semantically linked to the Apigee documentation. The Ansible groups used as
+semantically linked to the Apigee documentation. The [Ansible groups of groups](http://docs.ansible.com/ansible/latest/user_guide/intro_dynamic_inventory.html#static-groups-of-dynamic-groups) used as
 conventions correspond to the installation roles and server 
 categorizations called out in the [Apigee Private Cloud Installation](https://docs.apigee.com/private-cloud/v4.18.01/install-edge-components-node) and 
 Configuration Guide. It has been useful to use planet and region