diff --git a/doc/advanced/config-cheat-sheet.en-us.md b/doc/advanced/config-cheat-sheet.en-us.md
index 2c4d0110..a7f931b0 100644
--- a/doc/advanced/config-cheat-sheet.en-us.md
+++ b/doc/advanced/config-cheat-sheet.en-us.md
@@ -466,6 +466,7 @@ relation to port exhaustion.
 - `DEFAULT_ALLOW_ONLY_CONTRIBUTORS_TO_TRACK_TIME`: **true**: Only allow users with write permissions to track time.
 - `EMAIL_DOMAIN_WHITELIST`: **\<empty\>**: If non-empty, list of domain names that can only be used to register
   on this instance.
+- `EMAIL_DOMAIN_BLOCKLIST`: **\<empty\>**: If non-empty, list of domain names that cannot be used to register on this instance
 - `SHOW_REGISTRATION_BUTTON`: **! DISABLE\_REGISTRATION**: Show Registration Button
 - `SHOW_MILESTONES_DASHBOARD_PAGE`: **true** Enable this to show the milestones dashboard page - a view of all the user's milestones
 - `AUTO_WATCH_NEW_REPOS`: **true**: Enable this to let all organisation users watch new repos when they are created
diff --git a/doc/help/faq.en-us.md b/doc/help/faq.en-us.md
index 4346c89c..b3cf1aa0 100644
--- a/doc/help/faq.en-us.md
+++ b/doc/help/faq.en-us.md
@@ -120,13 +120,14 @@ For more information, refer to Gitea's [API docs]({{< relref "doc/developers/api
 
 There are multiple things you can combine to prevent spammers.
 
-1. By only whitelisting certain domains with OpenID (see below)
-2. Setting `ENABLE_CAPTCHA` to `true` in your `app.ini` and properly configuring `RECAPTCHA_SECRET` and `RECAPTCHA_SITEKEY`
-3. Settings `DISABLE_REGISTRATION` to `true` and creating new users via the [CLI]({{< relref "doc/usage/command-line.en-us.md" >}}), [API]({{< relref "doc/developers/api-usage.en-us.md" >}}), or Gitea's Admin UI
+1. By whitelisting or blocklisting certain email domains
+2. By only whitelisting certain domains with OpenID (see below)
+3. Setting `ENABLE_CAPTCHA` to `true` in your `app.ini` and properly configuring `RECAPTCHA_SECRET` and `RECAPTCHA_SITEKEY`
+4. Settings `DISABLE_REGISTRATION` to `true` and creating new users via the [CLI]({{< relref "doc/usage/command-line.en-us.md" >}}), [API]({{< relref "doc/developers/api-usage.en-us.md" >}}), or Gitea's Admin UI
 
-### Only allow certain email domains
+### Only allow/block certain email domains
 
-You can configure `EMAIL_DOMAIN_WHITELIST` in your app.ini under `[service]`
+You can configure `EMAIL_DOMAIN_WHITELIST` or `EMAIL_DOMAIN_BLOCKLIST` in your app.ini under `[service]`
 
 ### Only allow/block certain OpenID providers