diff --git a/guides/rails_guides/markdown.rb b/guides/rails_guides/markdown.rb
index 12eabcbcc8186b1b87c87983ffc62bcb4a4d6c14..6ad42769bc5508dd1b9b92d2e047a18440b145e2 100644
--- a/guides/rails_guides/markdown.rb
+++ b/guides/rails_guides/markdown.rb
@@ -23,7 +23,7 @@ def render(body)
     private
 
       def dom_id(nodes)
-        nodes.map{ |node| node.text.downcase.gsub(/[^a-z0-9]+/, '-') }.join('-')
+        nodes.map{ |node| node[:id] ? node[:id] : node.text.downcase.gsub(/[^a-z0-9]+/, '-') }.join('-')
       end
 
       def engine