diff --git a/README.md b/README.md
index 1d87d0544b346c73420bac3c03abbb86f27b90e7..a58bd1a79647e7994c0c5712eca0066471a0e24c 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,18 @@ Requirements
 Variables
 ---------
 
-*todo*
+* kea_ha_mode
+  * description:
+    * This option defines the high availabilty mode.
+    * If this option is set to *loadbalancing* the *dhcp_primary_server* is the primary server and the *dhcp_secondary_server* is the secondary server. All other servers of this host group are backup server. 
+    * If this option is set to *hotstandby* the *dhcp_primary_server* is the active server and the *dhcp_secondary_server* is the standby server. All other servers of this host group are backup server. 
+  * choices: [none, loadbalancing, hotstandby]
+  * default: none
+
+* kea_control_agent_port
+  * description:
+    * This option defines the communication port for the kea control agents.
+  * default: 8080
 
 Processes
 =========
diff --git a/templates/kea-dhcp-ha.j2 b/templates/kea-dhcp-ha.j2
index af208a5bb72dd9c289dbe2d057b48fac35fe8c8a..2ffda2e841f53b1d2c20a403020a9d34a3a1f4e2 100644
--- a/templates/kea-dhcp-ha.j2
+++ b/templates/kea-dhcp-ha.j2
@@ -6,9 +6,9 @@
 {%-        for ifname, ifdata in nodenetwork.devices.items() if ifdata.services is defined and ("dhcp-ha" in (ifdata.services | default([]))) %}
 {%-          set has = {"name": fctnhst}
 {%-          if ipversion == "ipv4" %}
-{%-            do has.update({"url": 'http://%s:%s/' | format(ifdata.ipv4 | default("127.0.0.1"), kea_ha_port)} %}
+{%-            do has.update({"url": 'http://%s:%s/' | format(ifdata.ipv4 | default("127.0.0.1"), kea_control_agent_port)} %}
 {%-          else %}
-{%-            do has.update({"url": 'http://[%s]:%s/' | format(ifdata.ipv6 | default("::1"), kea_ha_port)} %}
+{%-            do has.update({"url": 'http://[%s]:%s/' | format(ifdata.ipv6 | default("::1"), kea_control_agent_port)} %}
 {%-          endif %}
 {%-          if fctnhst != dhcp_primary_server or fctnhst != dhcp_secondary_server %}
 {%-            do has.update({"auto-failover": false, "role": "backup"}) %}
@@ -26,7 +26,7 @@
 {%-      endif %}
 {%-    endfor %}   
 
-{%-    if (ha_servers | length) > 0 -%}
+{%-    if (ha_servers | length) > 1 -%}
     "hooks-libraries": [
        {
           "library": "/usr/lib/hooks/libdhcp_lease_cmds.so",