--- a/testing/marionette/puppeteer/firefox/firefox_puppeteer/api/software_update.py
+++ b/testing/marionette/puppeteer/firefox/firefox_puppeteer/api/software_update.py
@@ -361,17 +361,18 @@ class SoftwareUpdate(BaseLib):
         :param update_url: URL to the update snippet
         """
         import urllib2
         try:
             response = urllib2.urlopen(update_url)
             return response.read()
         except urllib2.URLError:
             exc, val, tb = sys.exc_info()
-            raise Exception, "Failed to retrieve update snippet: {}".format(val), tb
+            raise Exception, "Failed to retrieve update snippet '{}': {}".format(
+                update_url, val), tb
 
     def get_formatted_update_url(self, force=False):
         """Retrieve the formatted AUS update URL the update snippet is retrieved from.
 
         :param force: Boolean flag to force an update check
 
         :returns: The URL of the update snippet
         """