diff --git a/README.md b/README.md
index 734ae6b..dfb6398 100644
--- a/README.md
+++ b/README.md
@@ -4,19 +4,20 @@ The website for the Chicago Summer of Learning, developed by Ocupop and Mozilla.
 
 ## Environment
 
-Property          | Default  | Description
-------------------|----------|-------------------------
-`CSOL_DB_NAME`    | `"csol"` | Name of the database.
-`CSOL_DB_USER`    | `"root"` | Database username.
-`CSOL_DB_PASS`    | `null`   | Database password.
-`CSOL_DB_HOST`    | `null`   | Database host.
-`CSOL_DB_PORT`    | `null`   | Database port.
-`CSOL_AWS_KEY`    | `null`   | AWS key (for storing uploads)
-`CSOL_AWS_SECRET` | `null`   | AWS secret
-`CSOL_AWS_REGION` | `null`   | AWS region (optional)
-`CSOL_AWS_BUCKET` | `null`   | AWS bucket
-`CSOL_HOST`       | `null`   | Canonical CSOL host (eg chicagosummeroflearning.org)
-`COOKIE_SECRET`   | `null`   | Seed for session cookie.
+Property            | Default  | Description
+--------------------|----------|-------------------------
+`CSOL_DB_NAME`      | `"csol"` | Name of the database.
+`CSOL_DB_USER`      | `"root"` | Database username.
+`CSOL_DB_PASS`      | `null`   | Database password.
+`CSOL_DB_HOST`      | `null`   | Database host.
+`CSOL_DB_PORT`      | `null`   | Database port.
+`CSOL_AWS_KEY`      | `null`   | AWS key (for storing uploads)
+`CSOL_AWS_SECRET`   | `null`   | AWS secret
+`CSOL_AWS_REGION`   | `null`   | AWS region (optional)
+`CSOL_AWS_BUCKET`   | `null`   | AWS bucket
+`CSOL_HOST`         | `null`   | Canonical CSOL host (eg http://chicagosummeroflearning.org)
+`CSOL_EMAIL_DOMAIN` | `null`   | Domain to send email from (if different from CSOL_HOST)
+`COOKIE_SECRET`     | `null`   | Seed for session cookie.
 `CSOL_OPENBADGER_URL`    | `null` | Openbadger API Location, http://obr.com/v2/
 `CSOL_OPENBADGER_SECRET` | `null` | A shared secret with Open Badger. Should match the OPENBADGER_JWT_SECRET variable on open badger
 `CSOL_AESTIMIA_URL`      | `null` | Aestimia API Location