diff --git a/README.md b/README.md
index c7d8c39..ebe5e6f 100644
--- a/README.md
+++ b/README.md
@@ -29,8 +29,8 @@ Based on [`mediawiki`][mediawiki].
 1. Edit `.envrc` and uncomment the `SMTP` lines. Set `SMTP_HOST` to
    `postfix_relay` for `coop-cloud/postfix_relay`, or `mailu_front` for
    `coop-cloud/mailu` (assuming default stack names)
-2. Make sure to add the domain to your email config – `EXTRA_SENDER_DOMAINS` in
-   `postfix_relay`, or in Mailu: Admin » Domains » Add.
+2. For `postfix_relay`,  add the domain to your email config – `EXTRA_SENDER_DOMAINS` in
+   `postfix_relay`. This doesn't seem to be required for Mailu.
 3. `direnv allow` (or `source .envrc`)
 4. `abra deploy`