diff --git a/config.sample.json b/config.sample.json
index 87f746c..454abdf 100644
--- a/config.sample.json
+++ b/config.sample.json
@@ -3,5 +3,6 @@
   "icann.account.password": "Abcdef#12345678",
   "authentication.base.url": "https://account-api.icann.org",
   "czds.base.url": "https://czds-api.icann.org",
-  "working.directory": "/where/zonefiles/will/be/saved"
+  "working.directory": "/where/zonefiles/will/be/saved",
+  "tlds": []
 }
diff --git a/download.py b/download.py
index ce1268b..7b200eb 100644
--- a/download.py
+++ b/download.py
@@ -24,6 +24,7 @@
 password = config['icann.account.password']
 authen_base_url = config['authentication.base.url']
 czds_base_url = config['czds.base.url']
+tlds = config.get('tlds', [])
 
 # This is optional. Default to current directory
 working_directory = config['working.directory']
@@ -49,7 +50,6 @@
     working_directory = '.'
 
 
-
 ##############################################################################################################
 # Second Step: authenticate the user to get an access_token.
 # Note that the access_token is global for all the REST API calls afterwards
@@ -75,7 +75,7 @@ def get_zone_links(czds_base_url):
 
     if status_code == 200:
         zone_links = links_response.json()
-        print("{0}: The number of zone files to be downloaded is {1}".format(datetime.datetime.now(),len(zone_links)))
+        print("{0}: The number of zone files to be downloaded is {1}".format(datetime.datetime.now(),len(tlds) or len(zone_links)))
         return zone_links
     elif status_code == 401:
         print("The access_token has been expired. Re-authenticate user {0}".format(username))
@@ -144,7 +144,12 @@ def download_zone_files(urls, working_directory):
 
     # Download the zone files one by one
     for link in urls:
-        download_one_zone(link, output_directory)
+        if len(tlds):
+            for tld in tlds:
+                if link.endswith('%s.zone' % tld):
+                    download_one_zone(link, output_directory)
+        else:
+            download_one_zone(link, output_directory)
 
 # Finally, download all zone files
 start_time = datetime.datetime.now()