diff --git a/.env b/.env
deleted file mode 100644
index 2faa615..0000000
--- a/.env
+++ /dev/null
@@ -1,3 +0,0 @@
-POSTGRES_DB=test
-POSTGRES_USER=test
-POSTGRES_PASSWORD=test
\ No newline at end of file
diff --git a/README.md b/README.md
index e0dabab..d1d35dc 100644
--- a/README.md
+++ b/README.md
@@ -103,6 +103,7 @@ psql> SELECT aws_commons.create_s3_uri(
 psql> \echo :s3_uri
 (test-bucket,animals.csv,us-east-1)
 
+-- Used to overide the credentials specified in docker-compose
 psql> SELECT aws_commons.create_aws_credentials(
    '<my_access_id>',
    '<my_secret_key>',
@@ -136,7 +137,7 @@ psql> select * from animals;
 ```
 
 You can also call the function as:
-```
+```postgresql
 psql> SELECT aws_s3.table_import_from_s3(
    'animals',
    '',
@@ -145,13 +146,16 @@ psql> SELECT aws_s3.table_import_from_s3(
       'test-bucket',
       'animals.csv',
       'us-east-1'
-   ),
+   )
+);
+```
+Add the following argument to overide the credentials:
+```postgresql
    aws_commons.create_aws_credentials(
       '<my_access_id>',
       '<my_secret_key>',
       '<session_token>'
    )
-);
 ```
 
 #### Using the function table_import_from_s3 with all the parameters
@@ -192,10 +196,7 @@ psql> SELECT aws_s3.table_import_from_s3(
     '(FORMAT CSV, DELIMITER '','', HEADER true)',
     'test-bucket',
     'animals.csv',
-    'us-east-1',
-    '<my_access_id>',
-    '<my_secret_key>',
-    '<session_token>'
+    'us-east-1'
 );
 
  table_import_from_s3
@@ -214,33 +215,20 @@ psql> select * from animals;
 (4 rows)
 ```
 
-If you use localstack, you can set `endpoint_url` to point to the localstack s3 endpoint:
-```
+If you use localstack, you can set `endpoint_url` to overide the localstack s3 endpoint set in docker-compose:
+```postgresql
 psql> SET aws_s3.endpoint_url TO 'http://localstack:4566'; 
 ```
 
-You can also set the AWS credentials:
-```
+Similarly, you can overide the AWS credentials:
+```postgresql
 psql> SET aws_s3.access_key_id TO 'dummy';
 psql> SET aws_s3.secret_key TO 'dummy';
 psql> SET aws_s3.session_token TO 'dummy';
 ```
-and then omit them from the function calls.
-
-For example:
-```
-psql> SELECT aws_s3.table_import_from_s3(
-    'animals',
-    '',
-    '(FORMAT CSV, DELIMITER '','', HEADER true)',
-    'test-bucket',
-    'animals.csv',
-    'us-east-1'
-);
-```
 
 You can pass them also as optional parameters. For example:
-```
+```postgresql
 psql> SELECT aws_s3.table_import_from_s3(
     'animals',
     '',
@@ -249,6 +237,9 @@ psql> SELECT aws_s3.table_import_from_s3(
     'animals.csv',
     'us-east-1',
     endpoint_url := 'http://localstack:4566'
+    my_access_id := 'dummy',
+    my_secret_key := 'dummy',
+    session_token := 'dummy'
 );
 ```
 
@@ -294,24 +285,28 @@ psql> SELECT * FROM aws_s3.query_export_to_s3(
       'test-bucket',
       'animals2.csv',
       'us-east-1'
-   ),
-   aws_commons.create_aws_credentials(
+   )
+   options := 'FORMAT CSV, DELIMITER '','', HEADER true'
+);
+```
+Note that credentials provided in the docker-compose environment can be overidden by adding the following argument to `aws_s3.query_export_to_s3`:
+```postgresql
+psql> SELECT * FROM aws_s3.query_export_to_s3(
+   ...,
+   credentials := aws_commons.create_aws_credentials(
       '<my_access_id>',
       '<my_secret_key>',
       '<session_token>'
-   ),
-   options := 'FORMAT CSV, DELIMITER '','', HEADER true'
+   )
 );
 ```
-If you set the AWS credentials:
+Similarly, they can be overidden using `SET`.
 ```
 psql> SET aws_s3.aws_s3.access_key_id TO 'dummy';
 psql> SET aws_s3.aws_s3.secret_key TO 'dummy';
 psql> SET aws_s3.session_token TO 'dummy';
 ```
 
-You can omit the credentials.
-
 ##### Example
 
 #### Using the function table_import_from_s3 with all the parameters
@@ -359,7 +354,7 @@ psql> SELECT * FROM aws_s3.query_export_to_s3(
              5 |              1 |             47
 ```
 
-If you set the AWS credentials:
+If you set your own the AWS credentials:
 ```
 psql> SET aws_s3.aws_s3.access_key_id TO 'dummy';
 psql> SET aws_s3.aws_s3.secret_key TO 'dummy';
@@ -388,11 +383,11 @@ $ psql -h localhost -p 15432 -U test test
 
 Initialize the extensions:
 ```
-psql> CREATE EXTENSION plpythonu;
+psql> CREATE EXTENSION plpython3u;
 psql> CREATE EXTENSION aws_s3;
 ```
 
-Set the endpoint url and the aws keys to use s3 (in localstack you can set the aws creds to any non-empty string):
+If you want to you can overide the environment variables set in docker-compose (Note: in localstack you can set the aws creds to any non-empty string):
 ```
 psql> SET aws_s3.endpoint_url TO 'http://localstack:4566';
 psql> SET aws_s3.aws_access_key_id TO 'dummy';
diff --git a/docker-compose.yml b/docker-compose.yml
index fe22435..39a5d76 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,7 +6,14 @@ services:
       dockerfile: mock-servers/postgres/Dockerfile
     ports:
       - "15432:5432"
-    env_file: .env
+    environment:
+      AWS_ACCESS_KEY_ID: localstack
+      AWS_SECRET_ACCESS_KEY: localstack
+      AWS_DEFAULT_REGION: us-east-1
+      AWS_ENDPOINT_URL_S3: http://localstack:4566
+      POSTGRES_DB: test
+      POSTGRES_USER: test
+      POSTGRES_PASSWORD: test
     volumes:
       - $PWD/mock-servers/postgres/docker-entrypoint-initdb.d:/docker-entrypoint-initdb.d
       - $PWD/mock-servers/postgres/data:/var/lib/postgresql/data
@@ -16,16 +23,17 @@ services:
     ports:
       - "4566:4566"
       - "9090:9090"
-    env_file:
-      - .env
     environment:
       SERVICES: "s3"
-      DEBUG: "true"
+      DEBUG: true
       DATA_DIR: mock-servers/localstack/data
       PORT_WEB_UI: 9090
       AWS_ACCESS_KEY_ID: localstack
       AWS_SECRET_ACCESS_KEY: localstack
       AWS_DEFAULT_REGION: us-east-1
+      POSTGRES_DB: test
+      POSTGRES_USER: test
+      POSTGRES_PASSWORD: test
     volumes:
       - $PWD/mock-servers/localstack/samples:/tmp/samples
-      - $PWD/mock-servers/localstack/docker-entrypoint-initaws.d:/docker-entrypoint-initaws.d
+      - $PWD/mock-servers/localstack/docker-entrypoint-initaws.d:/docker-entrypoint-initaws.d
\ No newline at end of file