diff --git a/ENVIRONMENT.md b/ENVIRONMENT.md
index 68dbf46..ae829ea 100644
--- a/ENVIRONMENT.md
+++ b/ENVIRONMENT.md
@@ -18,6 +18,8 @@
   ownCloud admin password.
 - `OWNCLOUD_ADMIN_USERNAME=admin` \
   ownCloud admin username.
+- `OWNCLOUD_ALLOW_SUBADMINS=` \
+  Enable or disable the subadmin (group admin) feature. Set to `true` to enable; unset leaves it disabled (ownCloud core default) (see [documentation](https://doc.owncloud.com/server/latest/admin_manual/configuration/server/config_sample_php_parameters.html#allow-or-disallow-the-group-administrator-subadmin-feature)).
 - `OWNCLOUD_ALLOW_USER_TO_CHANGE_DISPLAY_NAME=` \
   Allow or disallow users to change their display names (see [documentation](https://doc.owncloud.com/server/latest/admin_manual/configuration/server/config_sample_php_parameters.html#allow-or-disallow-users-to-change-their-display-names)).
 - `OWNCLOUD_ALLOW_USER_TO_CHANGE_MAIL_ADDRESS=` \
diff --git a/v24.04/overlay/etc/templates/config.php b/v24.04/overlay/etc/templates/config.php
index fe38444..bc5fb86 100644
--- a/v24.04/overlay/etc/templates/config.php
+++ b/v24.04/overlay/etc/templates/config.php
@@ -82,6 +82,10 @@ function getConfigFromEnv() {
     $config['allow_user_to_change_mail_address'] = getenv('OWNCLOUD_ALLOW_USER_TO_CHANGE_MAIL_ADDRESS') === 'true';
   }
 
+  if (getenv('OWNCLOUD_ALLOW_SUBADMINS') != '') {
+    $config['allow_subadmins'] = getenv('OWNCLOUD_ALLOW_SUBADMINS') === 'true';
+  }
+
   if (getenv('OWNCLOUD_STRICT_LOGIN_ENFORCED') != '') {
     $config['strict_login_enforced'] = getenv('OWNCLOUD_STRICT_LOGIN_ENFORCED') === 'true';
   }