diff --git a/README.md b/README.md
index 0286afd..c1160a8 100644
--- a/README.md
+++ b/README.md
@@ -45,20 +45,20 @@ docker run \
You may set the following environment variables to customize the container's behaviour:
-| Name | Value | Default |
-|--------------------------|-------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
-| CLIENT_DOMAIN_WHITELIST | A space separated list of domains you wish to allow to use your SMTP server. The default allows any client to try and authenticate. | No Default |
-| CONFIG_DELAY | The time to wait for cisagov/postfix-docker to finish configuring postfix. | 30 |
-| CONTACT_EMAIL | Let's Encrypt Contact Email. This is required by Let's Encrypt. | No Default |
-| DKIM_DELAY | The time to wait for opendkim to generate a dkim value. | 30 |
-| DNS_PROPAGATION_DELAY | The time for Let's Encrypt to wait for DNS changes. | 30 |
-| PRIMARY_DOMAIN | The domain postfix is running for. | No Default |
-| RELAY_SERVER | The relay server to use for outgoing mail. (If omitted, then no relay server is used.) | No Default |
-| RELAY_SERVER_CREDENTIALS | The username/password pair to use for the relay server. (In "username:password" format.) | No Default |
-| RELAY_SERVER_PORT | The port used by the SMTP relay server. | No Default |
-| RENEW_INTERVAL_IN_DAYS | The interval (in days) to attempt to renew the certificates. | 7 |
-| TEST_MODE | Set to "0" after you have tested certificate generation. | 1 |
-| USER_LIST | A newline separated list of user/password pairs:
"username1 password1\nusername2 password2\n"
(Alphanumerical characters only.) | "admin admin\n" |
+| Name | Value | Default |
+|--------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
+| CLIENT_DOMAIN_WHITELIST | A space separated list of domains you wish to allow to use your SMTP server. The default allows any client to try and authenticate. | No Default |
+| CONFIG_DELAY | The time to wait for cisagov/postfix-docker to finish configuring postfix. | 30 |
+| CONTACT_EMAIL | Let's Encrypt Contact Email. This is required by Let's Encrypt. | No Default |
+| DKIM_DELAY | The time to wait for opendkim to generate a dkim value. | 30 |
+| DNS_PROPAGATION_DELAY | The time for Let's Encrypt to wait for DNS changes. | 30 |
+| PRIMARY_DOMAIN | The domain postfix is running for. | No Default |
+| RELAY_SERVER | The relay server to use for outgoing mail. (If omitted, then no relay server is used.) | No Default |
+| RELAY_SERVER_CREDENTIALS | The username/password pair to use for the relay server. (In "username:password" format.) | No Default |
+| RELAY_SERVER_PORT | The port used by the SMTP relay server. | No Default |
+| RENEW_INTERVAL_IN_DAYS | The interval (in days) to attempt to renew the certificates. | 7 |
+| TEST_MODE | Set to "0" after you have tested certificate generation. | 1 |
+| USER_LIST | A newline separated list of user/password pairs:
"username1 password1\nusername2 password2\n"
(Use only alphanumerical characters; letters in username must be lowercase.) | "admin admin\n" |
### DNS Providers