diff --git a/docker-compose.greenlight.yml b/docker-compose.greenlight.yml
index 0ca79fa..6b72930 100644
--- a/docker-compose.greenlight.yml
+++ b/docker-compose.greenlight.yml
@@ -9,20 +9,22 @@ services:
     environment:
       DB_ADAPTER: postgresql
       DB_HOST: postgres
-      DB_NAME: greenlight
-      DB_USERNAME: postgres
-      DB_PASSWORD: password
+      DB_NAME: ${POSTGRES_DB}
+      DB_USERNAME: ${POSTGRES_USER}
+      DB_PASSWORD: ${POSTGRES_PASSWORD}
       BIGBLUEBUTTON_ENDPOINT: ${GREENLIGHT_ENDPOINT}
       BIGBLUEBUTTON_SECRET: ${SHARED_SECRET}
       SECRET_KEY_BASE: ${RAILS_SECRET}
+    depends_on:
+      - redis
     ports:
       - 10.7.7.1:5000:80
   postgres:
     image: postgres:12
     restart: unless-stopped
     environment:
-      POSTGRES_DB: greenlight
-      POSTGRES_USER: postgres
-      POSTGRES_PASSWORD: password
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
     volumes:
       - ./postgres-data:/var/lib/postgresql/data
\ No newline at end of file
diff --git a/sample.env b/sample.env
index 89da73b..a1cfc43 100644
--- a/sample.env
+++ b/sample.env
@@ -168,6 +168,21 @@ LDAP_FILTER=
 #
 ALLOW_GREENLIGHT_ACCOUNTS=true
 
+# To enable reCaptcha on the user sign up, define these 2 keys
+# You can obtain these keys by registering your domain using the following url:
+#
+#  https://www.google.com/recaptcha/admin
+#
+# RECAPTCHA_SITE_KEY=
+# RECAPTCHA_SECRET_KEY=
+
+# To enable Google Analytics on your site, set this key to the Google Analytics Property Tracking ID
+#
+#  https://analytics.google.com/analytics/web/
+#
+# GOOGLE_ANALYTICS_TRACKING_ID=
+
+
 # Set this to true if you want GreenLight to send verification emails upon
 # the creation of a new account
 #
@@ -295,3 +310,9 @@ HELP_URL=https://docs.bigbluebutton.org/greenlight/gl-overview.html
 #   invite - For invite only registration
 #   approval - For approve/decline registration
 DEFAULT_REGISTRATION=open
+
+# Specify database for Greenlight.
+# please change POSTGRES_PASSWORD with your secure password
+POSTGRES_DB=greenlight
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=verysecurepassword
\ No newline at end of file