diff --git a/app/views/admin/reserved_domains/index.haml b/app/views/admin/reserved_domains/index.haml
index 02134cd91..15840ff93 100644
--- a/app/views/admin/reserved_domains/index.haml
+++ b/app/views/admin/reserved_domains/index.haml
@@ -1,5 +1,5 @@
 - content_for :actions do
-  = link_to('#', class: 'btn btn-default', "data-container": "body", "data-title": t('list_format_is_in_yaml'), "data-content": "domain.ee: authinfopw<br>seconddomain.ee:<br>thirddomain.ee: authinfo3<br><br>#{t('if_auth_info_is_left_empty_it_will_be_auto_generated')}", "data-placement": "left", "data-toggle": "popover", "data-html" => "true") do
+  = link_to('#', class: 'btn btn-default', "data-container": "body", "data-title": t('list_format_is_in_yaml'), "data-content": "domain.ee: authinfopw<br>seconddomain.ee:<br>thirddomain.ee: authinfo3<br><br>#{t('if_auth_info_is_left_empty_it_will_be_auto_generated')}<br>#{t('each_domain_name_must_end_with_colon_sign')}", "data-placement": "left", "data-toggle": "popover", "data-html" => "true") do
     %span.glyphicon.glyphicon-info-sign{"aria-hidden" => "true"}
 
 = render 'shared/title', name: t(:reserved_domains)
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 7d64e4276..39a9676f5 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -922,4 +922,5 @@ en:
   welcome_to_eis_registrar_portal: 'Welcome to EIS Registrar portal'
   interfaces: 'Interfaces'
   list_format_is_in_yaml: 'List format is in YAML'
-  if_auth_info_is_left_empty_it_will_be_auto_generated: 'If auth info is left empty, it will be auto generated'
+  if_auth_info_is_left_empty_it_will_be_auto_generated: 'If auth info is left empty, it will be auto generated.'
+  each_domain_name_must_end_with_colon_sign: 'Each domain name must end with colon (:) sign.'