diff --git a/README.md b/README.md
index 2630f59..9491fe3 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,11 @@ source .venv/bin/activate
 pip install -r requirements.txt
 ```
 
-Update config.ini with you Flight Schedule Pro username and password
+Update config.ini with you Flight Schedule Pro tenant ID, username and password
+
+Tenant ID is the ID of the company that the user wishes to log in to
+This can be found in the login URL 
+[![Finding Tenant ID](/documentation/tenant_id.png "Tentant ID")]
 
 ## Config
 
diff --git a/documentation/tenant_id.png b/documentation/tenant_id.png
new file mode 100644
index 0000000..ebb434e
Binary files /dev/null and b/documentation/tenant_id.png differ