Update README.md

Author: cgroschupp

README.md

@@ -147,6 +147,9 @@ to `private_ip` before running the playbook, like:
 
 	TF_KEY_NAME=private_ip ansible-playbook --inventory-file=/path/to/terraform-inventory deploy/playbook.yml
 
+When using the same terraform module multiple times, the resources have the same name and overwrite themselves. It is therefore possible to set the environment variable TF_ADD_MODULE_PATH to add the module path to the base name.
+
+TF_ADD_MODULE_PATH=true ansible-playbook --inventory-file=/path/to/terraform-inventory deploy/playbook.yml
 ## Development
 
 It's just a Go app, so the usual: