diff --git a/README.md b/README.md
index 2be4bc8e1c059890b4666eaa97a3a3308bb2c316..2bb02b22b21f6d7d6fb7c8875836abd8ab2c15e1 100644
--- a/README.md
+++ b/README.md
@@ -410,7 +410,7 @@ The following is a comparison of the supported geocoding APIs. The "Limitations"
 
 #### Bing (`:bing`)
 
-* **API key**: required
+* **API key**: required (set `Geocoder.configure(:lookup => :bing, :api_key => key)`)
 * **Key signup**: http://www.bingmapsportal.com
 * **Quota**: 50,000 requests/24 hrs
 * **Region**: world