diff --git a/bin/build-content b/bin/build-content
index 300b93a..e233bed 100755
--- a/bin/build-content
+++ b/bin/build-content
@@ -52,6 +52,7 @@ categories.each do |category, url|
 
     File.open("#{CONTENT_DIR}/#{file_name(header)}.txt", "w") do |file|
       file.write(body)
+      file.write("\n\nSource: #{url}")
     end
   end
 end