diff --git a/app/assets/javascripts/sitewide/comments_sidebar.js b/app/assets/javascripts/sitewide/comments_sidebar.js
index 745e7c97b..bfe7c8e0c 100644
--- a/app/assets/javascripts/sitewide/comments_sidebar.js
+++ b/app/assets/javascripts/sitewide/comments_sidebar.js
@@ -13,6 +13,11 @@ var CommentsSidebar = (function() {
       $(SIDEBAR).removeClass('loading');
       $(SIDEBAR).find('.comments-subject-title').text(result.object_name);
       $(SIDEBAR).find('.comments-list').html(result.comments);
+      if (result.comment_addable) {
+        $(SIDEBAR).find('.comment-input-container').removeClass('hidden');
+      } else {
+        $(SIDEBAR).find('.comment-input-container').addClass('hidden');
+      }
     });
   }
 
diff --git a/app/controllers/comments_controller.rb b/app/controllers/comments_controller.rb
index 550ece7c0..3a000b01e 100644
--- a/app/controllers/comments_controller.rb
+++ b/app/controllers/comments_controller.rb
@@ -17,6 +17,7 @@ class CommentsController < ApplicationController
 
     render json: {
       object_name: @commentable.name,
+      comment_addable: comment_addable?(@commentable),
       comments: render_to_string(partial: 'shared/comments/comments_list.html.erb',
                                  locals: { comments: comments })
     }
diff --git a/app/helpers/comment_helper.rb b/app/helpers/comment_helper.rb
index 24c272117..aac5b1e9e 100644
--- a/app/helpers/comment_helper.rb
+++ b/app/helpers/comment_helper.rb
@@ -57,6 +57,19 @@ module CommentHelper
     end
   end
 
+  def comment_addable?(object)
+    case object.class.name
+    when 'MyModule'
+      can_create_comments_in_module?(object)
+    when 'Step', 'Result'
+      can_create_comments_in_module?(object.my_module)
+    when 'Project'
+      can_create_comments_in_project?(object)
+    else
+      false
+    end
+  end
+
   def comment_editable?(comment)
     case comment.type
     when 'TaskComment', 'StepComment', 'ResultComment'