diff --git a/README.md b/README.md
index ef08322024bf9b4c5f1d3a7c0bc26782bad9ffc8..ba4418f40aa3ddf6dba819c59285cb1705224ecc 100644
--- a/README.md
+++ b/README.md
@@ -50,8 +50,8 @@ The main variables to change are located in the directory ```environments/[env_n
 - hosts: kube-master
   roles:
     - { role: kubernetes/master, tags: master }
-    - { role: apps/k8s-skydns, tags: skydns }
-    - { role: apps/k8s-kube-ui, tags: kube-ui }
+    - { role: apps/k8s-skydns, tags: ['skydns', 'apps']  }
+    - { role: apps/k8s-fabric8, tags: ['fabric8', 'apps']  }
 
 - hosts: kube-node
   roles:
@@ -111,27 +111,30 @@ iptables -nLv -t nat
 
 
 #### Available apps, installation procedure
-Additionnal apps can be installed as git submodules.
-These submodules install Ansible roles, one role per app.
-
-You can list available submodules with the following command:
-```
-grep path .gitmodules | sed 's/.*= //'
-```
+Additionnal apps can be installed with ```ansible-galaxy```.
+you'll need to edit the file '*requirements.yml*' in order to chose needed apps.
+The list of available apps are available [there](https://github.com/ansibl8s)
 
 For instance if you will probably want to install a [dns server](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns) as it is **strongly recommanded**.
-In order to use this role you'll need to follow these steps
+In order to use this role you'll need the following entries in the file '*requirements.yml*' 
 ```
-git submodule init roles/apps/k8s-common roles/apps/k8s-skydns
-git submodule update
+- src: https://github.com/ansibl8s/k8s-common.git
+  path: roles/apps
+  # version: v1.0
+
+- src: https://github.com/ansibl8s/k8s-skydns.git
+  path: roles/apps
+  # version: v1.0
 ```
+**Note**: the role common is required by all the apps and provides the tasks and libraries needed.
+
 Then update your playbook with the chosen role
 ```
 ...
 - hosts: kube-master
   roles:
     - { role: kubernetes/master, tags: master }
-    - { role: apps/k8s-skydns, tags: skydns }
+    - { role: apps/k8s-skydns, tags: ['skydns', 'apps']  }
 ...
 ```
 Please refer to the [k8s-skydns readme](https://github.com/ansibl8s/k8s-skydns) for additionnal info.
@@ -175,3 +178,22 @@ Until now i didn't managed to get the monitoring addon working.
 Currently the api-server listens on both secure and insecure ports.
 The insecure port is mainly used for calico.
 Will be fixed soon.
+
+How to contribute
+------------------
+
+### Update available roles
+Alternatively the roles can be installed as git submodules.
+That way is easier if you want to do some changes and commit them.
+
+You can list available submodules with the following command:
+```
+grep path .gitmodules | sed 's/.*= //'
+```
+
+For instance if you will probably want to install a [dns server](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns) as it is **strongly recommanded**.
+In order to use this role you'll need to follow these steps
+```
+git submodule init roles/apps/k8s-common roles/apps/k8s-skydns
+git submodule update
+```
diff --git a/requirements.yml b/requirements.yml
new file mode 100644
index 0000000000000000000000000000000000000000..1195993b40c37a26b76b1438dfcfb56f211f4480
--- /dev/null
+++ b/requirements.yml
@@ -0,0 +1,36 @@
+---
+- src: https://github.com/ansibl8s/k8s-common.git
+  path: roles/apps
+  # version: v1.0
+
+- src: https://github.com/ansibl8s/k8s-skydns.git
+  path: roles/apps
+  # version: v1.0
+
+#- src: https://github.com/ansibl8s/k8s-kube-ui.git
+#  path: roles/apps
+#  # version: v1.0
+#
+#- src: https://github.com/ansibl8s/k8s-fabric8.git
+#  path: roles/apps
+#  # version: v1.0
+#
+#- src: https://github.com/ansibl8s/k8s-elasticsearch.git
+#  path: roles/apps
+#  # version: v1.0
+#
+#- src: https://github.com/ansibl8s/k8s-redis.git
+#  path: roles/apps
+#  # version: v1.0
+#
+#- src: https://github.com/ansibl8s/k8s-memcached.git
+#  path: roles/apps
+#  # version: v1.0
+#
+#- src: https://github.com/ansibl8s/k8s-haproxy.git
+#  path: roles/apps
+#  # version: v1.0
+#
+#- src: https://github.com/ansibl8s/k8s-postgres.git
+#  path: roles/apps
+#  # version: v1.0
diff --git a/roles/apps/k8s-common b/roles/apps/k8s-common
deleted file mode 160000
index 8a1b65075407adcb1d2bcdfbdf5d7479bbf6ce71..0000000000000000000000000000000000000000
--- a/roles/apps/k8s-common
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 8a1b65075407adcb1d2bcdfbdf5d7479bbf6ce71
diff --git a/roles/apps/k8s-fabric8 b/roles/apps/k8s-fabric8
deleted file mode 160000
index 354e2b33c83b8d02d01d0b842c321cb060e12d3d..0000000000000000000000000000000000000000
--- a/roles/apps/k8s-fabric8
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 354e2b33c83b8d02d01d0b842c321cb060e12d3d
diff --git a/roles/apps/k8s-kube-ui b/roles/apps/k8s-kube-ui
deleted file mode 160000
index 766ceeab47bb9122a11d066b0e95960a2ddc6fc1..0000000000000000000000000000000000000000
--- a/roles/apps/k8s-kube-ui
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 766ceeab47bb9122a11d066b0e95960a2ddc6fc1
diff --git a/roles/apps/k8s-postgres b/roles/apps/k8s-postgres
deleted file mode 160000
index 62efba7e423a6b5cbd365a4f55d96c392e776e02..0000000000000000000000000000000000000000
--- a/roles/apps/k8s-postgres
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 62efba7e423a6b5cbd365a4f55d96c392e776e02
diff --git a/roles/apps/k8s-skydns b/roles/apps/k8s-skydns
deleted file mode 160000
index b00d0ce5c952a9c0364f48babf95ad6357e82ccd..0000000000000000000000000000000000000000
--- a/roles/apps/k8s-skydns
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit b00d0ce5c952a9c0364f48babf95ad6357e82ccd