diff --git a/.env b/.env
index faed202b..3197d0df 100644
--- a/.env
+++ b/.env
@@ -196,3 +196,20 @@ MF_POSTGRES_READER_DB_SSL_MODE=disable
 MF_POSTGRES_READER_DB_SSL_CERT=""
 MF_POSTGRES_READER_DB_SSL_KEY=""
 MF_POSTGRES_READER_DB_SSL_ROOT_CERT=""
+
+# Twins
+MF_TWINS_LOG_LEVEL=debug
+MF_TWINS_HTTP_PORT=9021
+MF_TWINS_SERVER_CERT=""
+MF_TWINS_SERVER_KEY=""
+MF_TWINS_DB_NAME=mainflux-twins
+MF_TWINS_DB_HOST=twins-db
+MF_TWINS_DB_PORT=27018
+MF_TWINS_SINGLE_USER_EMAIL=""
+MF_TWINS_SINGLE_USER_TOKEN=""
+MF_TWINS_CLIENT_TLS=""
+MF_TWINS_CA_CERTS=""
+MF_TWINS_MQTT_URL=tcp://mqtt-adapter:1883
+MF_TWINS_THING_ID=
+MF_TWINS_THING_KEY=
+MF_TWINS_CHANNEL_ID=
diff --git a/Makefile b/Makefile
index a98b0c52..94451a54 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@
 BUILD_DIR = build
 SERVICES = users things http ws coap lora influxdb-writer influxdb-reader mongodb-writer \
 	mongodb-reader cassandra-writer cassandra-reader postgres-writer postgres-reader cli \
-	bootstrap opcua authn
+	bootstrap opcua authn twins
 DOCKERS = $(addprefix docker_,$(SERVICES))
 DOCKERS_DEV = $(addprefix docker_dev_,$(SERVICES))
 CGO_ENABLED ?= 0
diff --git a/docker/addons/twins/docker-compose.yml b/docker/addons/twins/docker-compose.yml
new file mode 100644
index 00000000..0ed5679c
--- /dev/null
+++ b/docker/addons/twins/docker-compose.yml
@@ -0,0 +1,56 @@
+# Copyright (c) Mainflux
+# SPDX-License-Identifier: Apache-2.0
+
+# This docker-compose file contains optional opcua-adapter and opcua-redis services
+# for the Mainflux platform. Since this services are optional, this file is dependent on the
+# docker-compose.yml file from <project_root>/docker/. In order to run these services,
+# core services, as well as the network from the core composition, should be already running.
+
+version: "3.7"
+
+networks:
+  docker_mainflux-base-net:
+    external: true
+
+volumes:
+  mainflux-twins-db-volume:
+  mainflux-twins-db-configdb-volume:
+
+services:
+  twins-db:
+    image: mongo:bionic
+    command: mongod --port ${MF_TWINS_DB_PORT}
+    container_name: mainflux-twins-db
+    restart: on-failure
+    environment:
+      MONGO_INITDB_DATABASE: ${MF_TWINS_DB_NAME}
+    ports:
+      - ${MF_TWINS_DB_PORT}:${MF_TWINS_DB_PORT}
+    networks:
+      docker_mainflux-base-net:
+    volumes:
+      - mainflux-twins-db-volume:/data/db      
+      - mainflux-twins-db-configdb-volume:/data/configdb
+
+  twins:
+    image: mainflux/twins:latest
+    container_name: mainflux-twins
+    restart: on-failure
+    environment:
+      MF_TWINS_LOG_LEVEL: ${MF_TWINS_LOG_LEVEL}
+      MF_TWINS_HTTP_PORT: ${MF_TWINS_HTTP_PORT}
+      MF_TWINS_DB_NAME: ${MF_TWINS_DB_NAME}
+      MF_TWINS_DB_HOST: ${MF_TWINS_DB_HOST}
+      MF_TWINS_DB_PORT: ${MF_TWINS_DB_PORT}
+      MF_TWINS_THING_ID: ${MF_TWINS_THING_ID}
+      MF_TWINS_THING_KEY: ${MF_TWINS_THING_KEY}
+      MF_TWINS_CHANNEL_ID: ${MF_TWINS_CHANNEL_ID}
+      MF_NATS_URL: ${MF_NATS_URL}
+      MF_AUTHN_URL: authn:${MF_AUTHN_GRPC_PORT}
+      MF_TWINS_MQTT_URL: ${MF_TWINS_MQTT_URL}
+    ports:
+      - ${MF_TWINS_HTTP_PORT}:${MF_TWINS_HTTP_PORT}
+    networks:
+       docker_mainflux-base-net:
+    depends_on:
+      - twins-db         
diff --git a/twins/README.md b/twins/README.md
index b4f8c232..08cd4b92 100644
--- a/twins/README.md
+++ b/twins/README.md
@@ -92,6 +92,29 @@ MF_TWINS_LOG_LEVEL: [Twins log level] MF_TWINS_HTTP_PORT: [Service HTTP port] MF
 
 ## Usage
 
+### Starting twins service
+
+The twins service publishes notifications on an mqtt topic of the format
+`channels/<MF_TWINS_CHANNEL_ID>/messages/<twinID>/<crudOp>`, where `crudOp`
+stands for the crud operation done on twin - create, update, delete or
+retrieve - or state - save state. In order to use twin service, one must
+inform it - via environment variables - about the Mainflux thing and
+channel used for mqtt notification publishing. You can use an already existing
+thing and channel - thing has to be connected to channel - or create new ones.
+
+To set the environment variables, please go to `.env` file and set the following
+variables:
+
+```
+MF_TWINS_THING_ID=
+MF_TWINS_THING_KEY=
+MF_TWINS_CHANNEL_ID=
+```
+
+with the corresponding values of the desired thing and channel. If you are
+running mainflux natively, than do the same thing in the corresponding console
+environment.
+
 For more information about service capabilities and its usage, please check out
 the [API documentation](swagger.yaml).