diff --git a/api-ref/src/wadls/compute-api/src/v2.1/common.ent b/api-ref/src/wadls/compute-api/src/v2.1/common.ent
index 5ca762fe6..2d33644c2 100644
--- a/api-ref/src/wadls/compute-api/src/v2.1/common.ent
+++ b/api-ref/src/wadls/compute-api/src/v2.1/common.ent
@@ -1710,8 +1710,35 @@
     xmlns:wadl="http://wadl.dev.java.net/2009/02"
     xml:lang="EN">
     <para>
-      The host status. Value is <code>UP</code> or <code>DOWN</code>.
+      The host status. Values where next value in list can override the previous:
     </para>
+    <itemizedlist>
+      <listitem>
+        <para>
+          <code>UP</code> if nova-compute up.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          <code>UNKNOWN</code> if nova-compute not reported by servicegroup driver.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          <code>DOWN</code> if nova-compute forced down.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          <code>MAINTENANCE</code> if nova-compute is disabled.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          Empty string indicates there is no host for server.
+        </para>
+      </listitem>
+    </itemizedlist>
     <para>
       This attribute appears in the response only if the policy permits.
     </para>