Mention postgis extension, which is necessary for geometry tests

README.md

@@ -320,3 +320,9 @@ in order to avoid modifying the system installation of Postgres.
 3. `make create_testdbs` # Creates the test database environment.
 
 3. `make test` # Runs the tests
+
+NOTE: you will need the postgis extensions to run these tests!  On
+Ubuntu, you can install them with a command like this:
+
+    apt-get install postgresql-9.3-postgis-2.1
+

test_data/test_schema.sql

@@ -7,11 +7,6 @@
 -- ssl support must be configured, and the sslinfo contrib module
 -- loaded for the ssl tests to succeed.
 
--- NOTE: you will need the postgis extensions to run these tests!
--- On Ubuntu, you can install them with a command like this:
---   apt-get install postgresql-9.3-postgis-2.1
-
-
 CREATE USER epgsql_test;
 CREATE USER epgsql_test_md5 WITH PASSWORD 'epgsql_test_md5';
 CREATE USER epgsql_test_cleartext WITH PASSWORD 'epgsql_test_cleartext';