diff --git a/app/views/robots_txt/index.erb b/app/views/robots_txt/index.erb
index f81e8128ce8..2d35051cf3c 100644
--- a/app/views/robots_txt/index.erb
+++ b/app/views/robots_txt/index.erb
@@ -1,4 +1,7 @@
-# See http://www.robotstxt.org/wc/norobots.html for documentation on how to use the robots.txt file
+# See http://www.robotstxt.org/robotstxt.html for documentation on how to use the robots.txt file
+<% if Discourse.base_uri.present? %>
+# This robots.txt file is not used. Please append the content below in the robots.txt file located at the root
+<% end %>
 #
 <% @allowed_user_agents.each do |user_agent| %>
 User-agent: <%= user_agent %>