diff --git a/README.md b/README.md
index 0aa27ee..acab7c5 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,7 @@
 
 This repository is used to store all our monitors templates ready to use for generic purpose.
 
-
-### How to contribute ? ###
+## How to contribute ? ##
 
 First, you may refresh your knowledge and look at the [terminology](https://confluence.fr.clara.net/display/DAT/Getting+started).
 
@@ -13,7 +12,7 @@ If you would like to resolve an issue or implement new monitors you must follow
 
 After any change you should run `./scripts/auto_update.sh ./` command to make sure all is up to date else the CI pipeline will fail on the branch.
 
-### Important notes ###
+## Important notes ##
 
 * This repository represents a terraform feature and each first level directory could be imported as a terraform module, you must choose the one(s) you need.
 * Each of these modules contains the most commons monitors, but they probably do not fulfill all your customer needs
@@ -21,54 +20,107 @@ After any change you should run `./scripts/auto_update.sh ./` command to make su
 * You will find a complete `README.md` on each module, explaining how to use it.
 * The `alerting-message` module could be used to easily generate a templating message to use by default but it could be used also multiple times to generate messages for specific monitors.
 
-### The DataDog provider ###
+## Getting started ##
 
-Before importing some modules, you must define the DataDog provider in your `main.tf`
+### Terraform ###
+
+Version >= 0.12 is required to use these modules of monitors.
+
+```
+terraform {
+  required_version = "~> 0.12"
+}
+
+```
+
+### DataDog provider ###
+
+Here is the last tester terraform provider version for datadog but next versions should work too.
 
 ```
 provider "datadog" {
-  version = "2.0.2"
+  version = "2.0.2" # last tested working version
 
-  api_key = "${var.datadog_api_key}"
-  app_key = "${var.datadog_app_key}"
+  api_key = var.datadog_api_key
+  app_key = var.datadog_app_key
 }
+
 ```
 
-Both of the `datadog_api_key` and `datadog_app_key` are unique to the client.
-
-### Module declaration example ###
-
-A quick example of using a set of monitors for a given terraform module:
+Both of the `datadog_api_key` and `datadog_app_key` are unique to the each datadog account. You can define them in `terraform.tfvars` file:
 
 ```
-variable "oncall_24x7" {
-  default = "@pagerduty-Public_Cloud_FR_-_Yoda_-_Unibail_HNO"
+datadog_api_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+datadog_app_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+```
+
+### Variables ###
+
+Some variables need to be declared.
+
+```
+variable "environment" {
+  type    = string
+  default = "dev"
 }
 
-variable "oncall_office_hours" {
-  default = "@pagerduty-Public_Cloud_FR_-_Yoda_-_Unibail_HO"
+variable "datadog_api_key" {
+  type = string
 }
 
-variable "oncall_nodata" {
-  default = "@pagerduty-Public_Cloud_FR_-_Yoda_-_Unibail_HNO"
+variable "datadog_app_key" {
+  type = string
+}
+
+```
+
+## Modules declaration example ##
+
+A quick example of alerting message module declaration:
+
+```
+locals {
+  oncall_24x7         = "@pagerduty-MyPagerService_NBH"
+  oncall_office_hours = "@pagerduty-MyPagerService_BH"
 }
 
 module "datadog-message-alerting" {
-  source                       = "git::ssh://git@bitbucket.org/morea/terraform.feature.datadog.git//common/alerting-message"
+  source = "git::ssh://git@git.fr.clara.net/claranet/pt-monitoring/projects/datadog/terraform/monitors.git//common/alerting-message?ref={RELEASE}"
 
-  message_alert                = "${var.oncall_24x7}"
-  message_warning              = "${var.oncall_office_hours}"
-  message_nodata               = "${var.oncall_nodata}"
+  message_alert   = local.oncall_24x7
+  message_warning = local.oncall_office_hours
+  message_nodata  = local.oncall_24x7
 }
 
-module "datadog-monitors-my-monitors-set" {
-  source                       = "git::ssh://git@bitbucket.org/morea/terraform.feature.datadog.git//my/monitors/set?ref={revision}"
+module "datadog-message-alerting-bh-only" {
+  source = "git::ssh://git@git.fr.clara.net/claranet/pt-monitoring/projects/datadog/terraform/monitors.git//common/alerting-message?ref={RELEASE}"
 
-  environment                  = "${var.environment}"
-  message                      = "${module.datadog-message-alerting.alerting-message}"
+  message_alert   = local.oncall_office_hours
+  message_warning = local.oncall_office_hours
+  message_nodata  = local.oncall_office_hours
 }
+
+module "datadog-monitors-system-generic" {
+  source = "git::ssh://git@git.fr.clara.net/claranet/pt-monitoring/projects/datadog/terraform/monitors.git//system/generic?ref={RELEASE}"
+
+  environment = var.environment
+  message     = module.datadog-message-alerting.alerting-message
+
+  memory_message = module.datadog-message-alerting-bh-only.alerting-message
+  # Use variables to customize monitors configuration
+}
+
+# Other monitors modules to declare ...
+#module "datadog-monitors-my-monitors-set" {
+#  source = "git::ssh://git@git.fr.clara.net/claranet/pt-monitoring/projects/datadog/terraform/monitors.git//my/monitors/set?ref={RELEASE}"
+#
+#  environment = var.environment
+#  message     = module.datadog-message-alerting.alerting-message
+#}
+
 ```
 
+Replace `{revision}` to the last git tag available on this repository.
 The `//` is very important, it's a terraform specific syntax used to separate git url and folder path.
 `my/monitors/set` represents the path to a monitors set sub directory listed below.