diff --git a/doc/ADMIN.md b/doc/ADMIN.md
index 5dd1161..e2ea899 100644
--- a/doc/ADMIN.md
+++ b/doc/ADMIN.md
@@ -1,3 +1,3 @@
 If you wish, you can add custom configurations inside `__INSTALL_DIR__/config.local.php`.
 
-For more than one instance, each will need a dedicated domain name for mail configuration, for example: domain.tld/paheko, paheko.domain.tld, paheko2.domain.tld
+**Important**: for some reason, email does not work when installing on a subpath. You are encouraged to use a full, dedicated for this domain (with path set to /)