diff --git a/app/views/moderation_queue/_block_instances_textarea.haml b/app/views/moderation_queue/_block_instances_textarea.haml
index 9729d4de..7daf0410 100644
--- a/app/views/moderation_queue/_block_instances_textarea.haml
+++ b/app/views/moderation_queue/_block_instances_textarea.haml
@@ -1,3 +1,3 @@
 .form-group
   = label_tag 'custom_blocklist', t('moderation_queue.instances.custom_block')
-  = text_area_tag 'custom_blocklist', nil, class: 'form-control'
+  = text_area_tag 'custom_blocklist', nil, class: 'form-control', placeholder: t('moderation_queue.instances.custom_block_placeholder')
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 075b62ec..35b857e6 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -182,6 +182,9 @@ en:
       title:  My block lists
       description: "Blocklists contain instances known for hosting hate speech, promote fascism, violence, sexual/gendered abuse and/or misinformation."
       custom_block: Custom block lists
+      custom_block_placeholder: |
+        a.doma.in
+        per.li.ne
       submit: Save block lists
     instance:
       users: "Users:"
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 2d4974b1..77e611ed 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -181,6 +181,9 @@ es:
       title:  Mis listas de bloqueo
       description: "Las listas de bloqueo contienen instancias conocidas por alojar discurso de odio, promover el fascismo, la violencia, abuso sexual y/o desinformación."
       custom_block: Lista personalizada de bloqueo
+      custom_block_placeholder: |
+        un.domin.io
+        por.lin.ea
       submit: Guardar listas de bloqueo
     instance:
       users: "Usuaries:"