diff --git a/app/config.py b/app/config.py
index 1865d255c..c207ff0dd 100644
--- a/app/config.py
+++ b/app/config.py
@@ -337,6 +337,7 @@ class Config(object):
     DOCUMENT_DOWNLOAD_API_HOST = os.environ.get('DOCUMENT_DOWNLOAD_API_HOST', 'http://localhost:7000')
     DOCUMENT_DOWNLOAD_API_KEY = os.environ.get('DOCUMENT_DOWNLOAD_API_KEY', 'auth-token')
 
+    # these environment vars aren't defined in the manifest so to set them on paas use `cf set-env`
     MMG_URL = os.environ.get("MMG_URL", "https://api.mmg.co.uk/jsonv2a/api.php")
     FIRETEXT_URL = os.environ.get("FIRETEXT_URL", "https://www.firetext.co.uk/api/sendsms/json")
 
diff --git a/manifest.yml.j2 b/manifest.yml.j2
index 2484d9328..b68848adf 100644
--- a/manifest.yml.j2
+++ b/manifest.yml.j2
@@ -92,12 +92,10 @@ applications:
 
       ZENDESK_API_KEY: '{{ ZENDESK_API_KEY }}'
 
-      MMG_URL: '{{ MMG_URL }}'
       MMG_API_KEY: '{{ MMG_API_KEY }}'
       MMG_INBOUND_SMS_AUTH: '{{ MMG_INBOUND_SMS_AUTH | tojson }}'
       MMG_INBOUND_SMS_USERNAME: '{{ MMG_INBOUND_SMS_USERNAME | tojson }}'
 
-      FIRETEXT_URL: '{{ FIRETEXT_URL }}'
       FIRETEXT_API_KEY: '{{ FIRETEXT_API_KEY }}'
       FIRETEXT_INBOUND_SMS_AUTH: '{{ FIRETEXT_INBOUND_SMS_AUTH | tojson }}'