diff --git a/classes/nvd_downloader.rb b/classes/nvd_downloader.rb
index dec2699..365e267 100644
--- a/classes/nvd_downloader.rb
+++ b/classes/nvd_downloader.rb
@@ -63,4 +63,8 @@ class NvdDownloader
         # this should be a method that builds 
         # the modified filename with the meta file extension included
     end
+
+    def detect_changes(metafile)
+        # this should be a method that detects changes in the metafile. 
+    end
 end
\ No newline at end of file