Update README.md

README.md

@@ -45,4 +45,4 @@ This is still experimental and does not fully restore all the petty functionalit
 Short answer is no. You can browse throught the [archive page](https://nouvelle-nouveau.tumblr.com/archive) without this extension. This extension is mainly to bring back the original aesthetics of the blog. This helps in realising how the artsy content posted by L.L. complements with the layout of the original blog ui to bring about a pleasant and stylish look and feel that L.L. intended. 
 
 ## Visit posts made on a certain day
-From version 0.1.0 onwards, you can now view posts that [nouvelle-nouveau](https://nouvelle-nouveau.tumblr.com/) made on a certain date by entering `https://nouvelle-nouveau.tumblr.com/day/yyyy/mm/dd`. This is not really possible (as I know of) on Tumblr's archive page (it is only specific to the month).
+From version 0.1.0 onwards, you can now view posts that [nouvelle-nouveau](https://nouvelle-nouveau.tumblr.com/) made on a certain date by entering `https://nouvelle-nouveau.tumblr.com/day/yyyy/mm/dd`. This is not really possible (as I know of) on Tumblr's archive page (it is only specific to the month). Replace yyyy with the full years of 2011, 2012 or 2013; replace mm with month number (1 - 12, padding of zeros is not needed); replace dd with the date (1 - 31). If you received a 404 Not Found error, it means there were no posts on that date.