diff --git a/plugins/opennebula/README.md b/plugins/opennebula/README.md
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+# Open Nebula context plugin
+
+This plugin adds OpenNebula contextualization to the virtual image (see http://opennebula.org/documentation:rel4.2:cong).
+
+It set ups the network and ssh keys. TO do so you should configure your virtual machine context with something like:
+
+    ETH0_DNS            $NETWORK[DNS, NETWORK_ID=2]
+    ETH0_GATEWAY        $NETWORK[GATEWAY, NETWORK_ID=2]
+    ETH0_IP             $NIC[IP, NETWORK_ID=2]
+    ETH0_MASK	        $NETWORK[MASK, NETWORK_ID=2]
+    ETH0_NETWORK        $NETWORK[NETWORK, NETWORK_ID=2]
+    FILES               path_to_my_ssh_public_key.pub
+
+Plugin will install all *.pub* files in the root authorized_keys file.
+
+In case of an EC2 start, if the USER_EC2_DATA element is a script, the plugin will execute it.
+
diff --git a/plugins/user_packages/README.md b/plugins/user_packages/README.md
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+# User package plugin
+
+This plugin gives the possibility to the user to install Debian packages in the virtual image.
+
+Plugin is defined in the manifest file, plugin section with:
+
+    "user_packages": {
+        "enabled": true,
+        "repo": [ "apache2" ],
+        "local": [ "/tmp/mypackage.deb" ]
+    }
+
+The *repo* element refers to packages available in Debian repository (apt-get).
+
+The *local* element will copy the specified .deb files and install them in the image with a dpkg command. Packages are installed in the order of their declaration.