diff --git a/CHANGELOG.md b/CHANGELOG.md
index 592c6eb..dba11a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 * Add netstats plugin managment.
 * Add smart plugin from https://github.com/skazi0/xymon-plugins
 * Add smartoverall plugin from https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/xymon/plugins/client/ext/smartoverall
+* Add description for plugins.
 
 ### Fix
 * Don't remove any plugin dependencies cause some plugins might have the same.
diff --git a/README.md b/README.md
index 61ad2f5..1b91a60 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 1. [Overview](#overview)
 2. [Role Variables](#role-variables)
+     * [Plugins Specific Variables](#plugins-specific-variables)
      * [OS Specific Variables](#os-specific-variables)
 3. [Example Playbook](#example-playbook)
 4. [Configuration](#configuration)
@@ -27,6 +28,14 @@ Manage Xymon (client) installation and configuration.
 * **xymon_cli_service_enabled** : Set `xymon-client` service available at startup [default : `true`].
 * **xymon_srv_list** : The list of Xymon servers (you must give an hostname, IP,… reachable from any clients) [defaults : `monitoring.{{ ansible_domain }}`].
 * **xymon_plug_manage** : If this role should manage plugins configuration [default : `true`].
+
+### Plugins Variables
+
+#### APT
+
+Variables for the APT plugin from hobbit-plugins. The plugin check for
+outstanding updates.
+
 * **xymon_plug_apt_state** : The state of plugin `apt` [default : `true`].
 * **xymon_plug_apt_package** : The packages to install to provide `apt` plugin [default : `[ 'libtimedate-perl' ]`].
 * **xymon_plug_apt_path** : Configuration file for the `apt` plugin [default : `/etc/xymon/clientlaunch.d/apt.cfg`].
@@ -36,11 +45,23 @@ Manage Xymon (client) installation and configuration.
 * **xymon_plug_apt_whitelist: All hosts list of allowed packages not installed from repositories [default : `[]`].
 * **xymon_plug_apt_group_whitelist: Group list of allowed packages not installed from repositories [default : `[]`].
 * **xymon_plug_apt_host_whitelist: Host list of allowed packages not installed from repositories [default : `[]`].
+
+#### IPMI
+
+Variables for the IPMI plugin from hobbit-plugins. The plugin read IPMI
+sensors and event log.
+
 * **xymon_cli__plug_ipmi_state** : The state of plugin `ipmi` [default : `false`].
 * **xymon_cli__plug_ipmi_state** : The packages to install to provide `ipmi` plugin [default : `[ 'ipmitool' ]`].
 * **xymon_cli__plug_ipmi_path** : Configuration file for the `ipmi` plugin [default : `/etc/xymon/clientlaunch.d/ipmi.cfg`].
 * **xymon_cli__plug_ipmi_tpl** : Template used to generate the previous config file [default : `etc/xymon/clientlaunch.d/ipmi.cfg.j2`].
 * **xymon_cli__plug_ipmi_interval** : Time between each run of the `ipmi` plugin [default : `5m`].
+
+#### Libs
+
+Variables for the Libs plugin from hobbit-plugins. The plugin check for running
+processes with upgraded libraries.
+
 * **xymon_plug_libs_state** : The state of plugin `libs` [default : `true`].
 * **xymon_plug_libs_package** : The packages to install to provide `libs` plugin [default : `[ 'binutils', 'lsof', 'libyaml-tiny-perl', 'libsort-naturally-perl' ]`].
 * **xymon_plug_libs_path** : Configuration file for the `libs` plugin [default : `/etc/xymon/clientlaunch.d/libs.cfg`].
@@ -50,16 +71,37 @@ Manage Xymon (client) installation and configuration.
 * **xymon_plug_libs_whitelist** : All hosts whitelist of processes that should not be monitored with `libs` plugin.
 * **xymon_plug_libs_group_whitelist** : Group whitelist of processes that should not be monitored with `libs` plugin.
 * **xymon_plug_libs_host_whitelist** : Host whitelist of processes that should not be monitored with `libs` plugin.
+
+#### Mq
+
+Variables for the Mq plugin from hobbit-plugins. The plugin check Postfix's
+mail queue.
+
 * **xymon_plug_mq_state** : The state of plugin `mq` [default : `true`].
 * **xymon_plug_mq_package** : The packages to install to provide `mq` plugin [default : `[ 'libtimedate-perl' ]`].
 * **xymon_plug_mq_path** : Configuration file for the `mq` plugin [default : `/etc/xymon/clientlaunch.d/mq.cfg`].
 * **xymon_plug_mq_tpl** : Template used to generate the previous config file [default : `etc/xymon/clientlaunch.d/mq.cfg.j2`].
 * **xymon_plug_mq_interval** : Time between each run of the `mq` plugin [default : `5m`].
+
+#### Netstats
+
+Variables for the Net/Netstats plugin from hobbit-plugins. The plugin check
+network interface states.
+
 * **xymon_cli__plug_netstats_state** : The state of plugin `netstats` [default : `false`].
 * **xymon_cli__plug_netstats_package** : The packages to install to provide `netstats` plugin [default : `[ 'libfile-which-perl', 'libfile-slurp-perl', 'libipc-run-perl', 'libyaml-tiny-perl', 'iproute2', 'ethtool' ]`].
 * **xymon_cli__plug_netstats_path** : Configuration file for the `netstats` plugin [default : `/etc/xymon/clientlaunch.d/netstats.cfg`].
 * **xymon_cli__plug_netstats_tpl** : Template used to generate the previous config file [default : `etc/xymon/clientlaunch.d/netstats.cfg.j2`].
 * **xymon_cli__plug_netstats_interval** : Time between each run of the `netstats` plugin [default : `5m`].
+
+#### Smartoverall
+
+Variables for Smartoverall plugin from [ipr-cnrs.scripts][smartoverall plugin source].
+The plugin will try to display health status of each disks (with SMART support)
+but it can't check that a recent test was successfully done.
+This plugin is mostly useful for disks unknown from smartmontools's database.
+For more features, see the next Smart plugin.
+
 * **xymon_cli__plug_smartoverall_state** : The state of plugin `smartoverall` [default : `False`].
 * **xymon_cli__plug_smartoverall_package** : The packages to install to provide `smartoverall` plugin [default : `[ 'smartmontools' ]`].
 * **xymon_cli__plug_smartoverall_script_path** : Path to the `smartoverall` script [default : `'/usr/lib/xymon/client/ext/smartoverall'`].
@@ -67,6 +109,13 @@ Manage Xymon (client) installation and configuration.
 * **xymon_cli__plug_smartoverall_path** : Configuration file for the `smartoverall` plugin [default : `'/etc/xymon/clientlaunch.d/smartoverall.cfg'`].
 * **xymon_cli__plug_smartoverall_tpl** : Template used to generate the previous config file [default : `'etc/xymon/clientlaunch.d/smartoverall.cfg.j2'`].
 * **xymon_cli__plug_smartoverall_interval** : Time between each run of the `smartoverall` plugin [default : `'10m'`]
+
+#### Smart
+
+Variables for Smart plugin from [skazi0 xymon-plugins][smart plugin source].
+The plugin check health status for each disks, compare current values with the
+one's recommended by the vendor and check a recent (<24h) test was done.
+
 * **xymon_cli__plug_smart_state** : The state of plugin `smart` [default : `False`].
 * **xymon_cli__plug_smart_package** : The packages to install to provide `smart` plugin [default : `[ 'smartmontools' ]`].
 * **xymon_cli__plug_smart_script_path** : Path to the `smart` script [default : `'/usr/lib/xymon/client/ext/smart'`].
@@ -74,6 +123,12 @@ Manage Xymon (client) installation and configuration.
 * **xymon_cli__plug_smart_path** : Configuration file for the `smart` plugin [default : `'/etc/xymon/clientlaunch.d/smart.cfg'`].
 * **xymon_cli__plug_smart_tpl** : Template used to generate the previous config file [default : `'etc/xymon/clientlaunch.d/smart.cfg.j2'`].
 * **xymon_cli__plug_smart_interval** : Time between each run of the `smart` plugin [default : `'10m'`]
+
+#### ZFS
+
+Variables for ZFS plugin from [Xymonton][zfs plugin source]. The plugin check
+health (global and for pools), capacity and snapshot status.
+
 * **xymon_cli__plug_zfs_state** : The state of plugin `zfs` [default : `false`].
 * **xymon_cli__plug_zfs_script_path** : Path to the ZFS script [default : `/usr/lib/xymon/client/ext/zfs`].
 * **xymon_cli__plug_zfs_script_tpl** : Template used to generate the previous script [default : `usr/lib/xymon/client/ext/zfs.j2`].
@@ -136,3 +191,7 @@ Jérémy Gardais
 [xymon github]: https://github.com/ipr-cnrs/xymon
 [wtfpl website]: http://www.wtfpl.net/about/
 [ipr website]: https://ipr.univ-rennes1.fr/
+
+[smartoverall plugin source]: https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/xymon/plugins/client/ext/smartoverall
+[smart plugin source]: https://github.com/skazi0/xymon-plugins
+[zfs plugin source]: https://wiki.xymonton.org/doku.php/monitors:bb-zfs