diff --git a/README.md b/README.md
index c16daa3..54bf349 100644
--- a/README.md
+++ b/README.md
@@ -208,6 +208,7 @@ ALTER USER postgres_exporter SET SEARCH_PATH TO postgres_exporter,pg_catalog;
 -- GRANT postgres_exporter TO <MASTER_USER>;
 CREATE SCHEMA IF NOT EXISTS postgres_exporter;
 GRANT USAGE ON SCHEMA postgres_exporter TO postgres_exporter;
+GRANT CONNECT ON DATABASE postgres TO postgres_exporter;
 
 CREATE OR REPLACE FUNCTION get_pg_stat_activity() RETURNS SETOF pg_stat_activity AS
 $$ SELECT * FROM pg_catalog.pg_stat_activity; $$