diff --git a/README.md b/README.md
index e52f40e..932abdf 100644
--- a/README.md
+++ b/README.md
@@ -348,6 +348,7 @@ sudo pdsadmin update
 | `PDS_EMAIL_SMTP_URL`                        | None                               |
 | `PDS_EMAIL_FROM_ADDRESS`                    | None                               |
 | `PDS_PRIVACY_POLICY_URL`                    | None                               |
+| `PDS_TERMS_OF_SERVICE_URL`                  | None
 | `PDS_RATE_LIMITS_ENABLED`                   | `true`                             |
 | `PDS_INVITE_REQUIRED`                       | `true`                             |