diff --git a/geocoder/available-services/README.md b/geocoder/available-services/README.md
new file mode 100644
index 0000000..25dab7e
--- /dev/null
+++ b/geocoder/available-services/README.md
@@ -0,0 +1,12 @@
+Available Services
+===============
+
+### Function
+
+Can be used to lookup available services by country name. Example,
+
+```sql
+SELECT (admin0_available_services(Array['United States', 'ESP'])).*
+```
+
+The functions in sql/build_services_table.sql should be run after any postalcode update.
\ No newline at end of file
diff --git a/geocoder/available-services/sql/services.sql b/geocoder/available-services/sql/services.sql
index f049ca4..b972dd3 100644
--- a/geocoder/available-services/sql/services.sql
+++ b/geocoder/available-services/sql/services.sql
@@ -1,6 +1,9 @@
 --CREATE TYPE available_services_v1 AS (q TEXT, adm0_a3 TEXT, postal_code_points BOOLEAN, postal_code_polygons BOOLEAN);
 
-CREATE OR REPLACE FUNCTION admin0_available_services(countries text[])
+--EXAMPLE
+-- SELECT (admin0_available_services(Array['United States', 'ESP'])).*
+
+CREATE OR REPLACE FUNCTION admin0_available_services(name text[])
   RETURNS SETOF available_services_v1 AS $$
   DECLARE 
     ret available_services_v1%rowtype;