diff --git a/config/description.exs b/config/description.exs
index 411029c27..c72231faa 100644
--- a/config/description.exs
+++ b/config/description.exs
@@ -688,8 +688,8 @@
       %{
         key: :quarantined_instances,
         type: {:list, :tuple},
-        keyPlaceholder: "instance",
-        valuePlaceholder: "reason",
+        key_placeholder: "instance",
+        value_placeholder: "reason",
         description:
           "List of ActivityPub instances where private (DMs, followers-only) activities will not be sent and the reason for doing so",
         suggestions: [