diff --git a/address/README.md b/address/README.md
index f49191e..2b02b9b 100644
--- a/address/README.md
+++ b/address/README.md
@@ -4,3 +4,4 @@ Address lookup by postcode
 
 Lookup UK addresses by postcode. Simply provide a valid postcode and get a full list of addresses.
 
+Powered by [ideal-postcodes.co.uk](https://ideal-postcodes.co.uk/).