diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index ef1af57e..9d44b02e 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -188,16 +188,21 @@ class ExercisesController < ApplicationController
 
     @experiment_group = UserGroupSeparator.getInterventionGroup(current_user)
 
+    showInterventions = (is_experimental_course and not user_solved_exercise and not user_got_enough_interventions) ? "true" : "false"
 
     case @experiment_group
-      # todo
+      when :rfc_intervention_stale_rfc
+        @show_rfc_interventions = showInterventions
+      when :break_intervention_stale_rfc
+        @show_break_interventions = showInterventions
+      when :no_intervention_stale_rfc
       when :no_intervention_hide_rfc
         @hide_rfc_button = "true"
-      when :no_intervention_stale_rfc
-      when :break_intervention
-        @show_break_interventions = (is_experimental_course and not user_solved_exercise and not user_got_enough_interventions) ? "true" : "false"
-      when :rfc_intervention
-        @show_rfc_interventions = (is_experimental_course and not user_solved_exercise and not user_got_enough_interventions) ? "true" : "false"
+      when :break_intervention_show_rfc
+        @show_break_interventions = showInterventions
+      when :no_intervention_show_rfc
+      when :rfc_intervention_show_rfc
+        @show_rfc_interventions = showInterventions
     end
 
 
diff --git a/app/views/exercises/_editor.html.slim b/app/views/exercises/_editor.html.slim
index 28668a89..591d5b75 100644
--- a/app/views/exercises/_editor.html.slim
+++ b/app/views/exercises/_editor.html.slim
@@ -15,8 +15,9 @@
       = render('editor_button', data: {:'data-placement' => 'top', :'data-tooltip' => true}, icon: 'fa fa-stop', id: 'stop', label: t('exercises.editor.stop'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + r'))
       = render('editor_button', data: {:'data-placement' => 'top', :'data-tooltip' => true}, icon: 'fa fa-rocket', id: 'test', label: t('exercises.editor.test'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + t'))
       = render('editor_button', data: {:'data-placement' => 'top', :'data-tooltip' => true}, icon: 'fa fa-trophy', id: 'assess', label: t('exercises.editor.score'), title: t('shared.tooltips.shortcut', shortcut: 'ALT + s'))
-      //- if not hide_rfc_button
-      //  = render('editor_button', icon: 'fa fa-comment', id: 'requestComments', label: t('exercises.editor.requestComments'), title: t('exercises.editor.requestCommentsTooltip'))
+      // todo: check this
+      - if not hide_rfc_button
+        = render('editor_button', icon: 'fa fa-comment', id: 'requestComments', label: t('exercises.editor.requestComments'), title: t('exercises.editor.requestCommentsTooltip'))
     - @files.each do |file|
       = render('editor_frame', exercise: exercise, file: file)
     #autosave-label