diff --git a/src/openforms/js/components/admin/form_design/registrations/json/fields/RelativeAPIEndpoint.js b/src/openforms/js/components/admin/form_design/registrations/json/fields/RelativeAPIEndpoint.js
index 66ea4a3c1b..d69485c149 100644
--- a/src/openforms/js/components/admin/form_design/registrations/json/fields/RelativeAPIEndpoint.js
+++ b/src/openforms/js/components/admin/form_design/registrations/json/fields/RelativeAPIEndpoint.js
@@ -8,7 +8,6 @@ import {TextInput} from 'components/admin/forms/Inputs';
 
 
 const RelativeAPIEndpoint = () => {
-  // TODO-4098: is this the serializer name?
   const [fieldProps] = useField('relativeApiEndpoint');
   return (
     <FormRow>
diff --git a/src/openforms/registrations/contrib/json/config.py b/src/openforms/registrations/contrib/json/config.py
index 581c72ea35..8b309be3d7 100644
--- a/src/openforms/registrations/contrib/json/config.py
+++ b/src/openforms/registrations/contrib/json/config.py
@@ -9,21 +9,17 @@
 
 
 class JSONOptionsSerializer(JsonSchemaSerializerMixin, serializers.Serializer):
-    # TODO-4098: is service enough, or do we need an API group like the ObjectsAPI?
     service = PrimaryKeyRelatedAsChoicesField(
         queryset=Service.objects.all(),
         label=_("Service"),
         help_text=_("Which service to use."),
     )
-    # TODO-4098: show the complete API endpoint as a (tooltip) hint after user entry?
+    # TODO-4098: show the complete API endpoint as a (tooltip) hint after user entry? Might be a front-end thing...
     relative_api_endpoint = serializers.CharField(
         max_length=255,
         label=_("Relative API endpoint"),
         help_text=_("The API endpoint to send the data to (relative to the service API root)."),
     )
-    # TODO-4098: should be linked to the checkboxes in the form variable table
-    # TODO-4098: is it possible to have a choices field of variable keys, where you can select them
-    #  from a drop-down list?
     form_variables = serializers.ListField(
         child=FormioVariableKeyField(max_length=50),
         label=_("Form variable key list"),