diff --git a/README.md b/README.md
index 0f4d57c..15086fe 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,8 @@ cartodb functions from the 'public' schema. All new cartodb objects will
 be in the "cartodb" schema.
 
 ```sql
+CREATE EXTENSION postgis FROM unpackaged;
+CREATE EXTENSION schema_triggers;
 CREATE EXTENSION cartodb FROM unpackaged;
 ```