diff --git a/lec_04_wrangling.ipynb b/lec_04_wrangling.ipynb
index c2fc390..effcaa6 100644
--- a/lec_04_wrangling.ipynb
+++ b/lec_04_wrangling.ipynb
@@ -90,7 +90,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Here's a preview of the raw data we'll use -- it's a list of the 10,000 movies made since 1950 with the most IMDB user ratings. It was scraped about a year ago from [pages like this](http://www.imdb.com/search/title?sort=num_votes,desc&title_type=feature&year=1950,2012)."
+      "Here's a preview of the raw data we'll use -- it's a list of the 10,000 movies made since 1950 with the most IMDB user ratings. It was scraped about a year ago from [pages like this](http://www.imdb.com/search/title?sort=num_votes,desc&title_type=feature&year=1950,2012). Download the data at [http://bit.ly/cs109_imdb](http://bit.ly/cs109_imdb)."
      ]
     },
     {