diff --git a/doc/admin-guide-cloud/blockstorage/section_consistency_groups.xml b/doc/admin-guide-cloud/blockstorage/section_consistency_groups.xml
index 952ee231d9..35a3b0f5bb 100644
--- a/doc/admin-guide-cloud/blockstorage/section_consistency_groups.xml
+++ b/doc/admin-guide-cloud/blockstorage/section_consistency_groups.xml
@@ -85,6 +85,13 @@
         <listitem>
             <para>Delete a consistency group.</para>
         </listitem>
+        <listitem>
+            <para>Modify a consistency group.</para>
+        </listitem>
+        <listitem>
+            <para>Create a consistency group from the snapshot of another
+                consistency group.</para>
+        </listitem>
     </itemizedlist>
     <para>The following operations are not allowed if a volume
         is in a consistency group:</para>
@@ -220,4 +227,31 @@ volume-types</screen>
     <note><para>The force flag is needed when there are volumes in the
         consistency group.</para></note>
     <screen><prompt>$</prompt> <userinput>cinder consisgroup-delete --force 1de80c27-3b2f-47a6-91a7-e867cbe36462</userinput></screen>
+    <para>Modify a consistency group:</para>
+    <screen>cinder consisgroup-update
+[--name <replaceable>NAME</replaceable>]
+[--description <replaceable>DESCRIPTION</replaceable>]
+[--add-volumes <replaceable>UUID1,UUID2,......</replaceable>]
+[--remove-volumes <replaceable>UUID3,UUID4,......</replaceable>]
+<replaceable>CG</replaceable></screen>
+    <para>The parameter <replaceable>CG</replaceable> is required.
+        It can be a name or UUID of a consistency group.
+        <replaceable>UUID1,UUID2,......</replaceable> are
+        UUIDs of one or more volumes to be added to the
+        consistency group, separated by commas. Default is None.
+        <replaceable>UUID3,UUId4,......</replaceable> are
+        UUIDs of one or more volumes to be removed from the
+        consistency group, separated by commas. Default is None.
+    </para>
+    <screen><prompt>$</prompt> <userinput>cinder consisgroup-update --name 'new name' --description 'new description' --add-volumes 0b3923f5-95a4-4596-a536-914c2c84e2db,1c02528b-3781-4e32-929c-618d81f52cf3 --remove-volumes 8c0f6ae4-efb1-458f-a8fc-9da2afcc5fb1,a245423f-bb99-4f94-8c8c-02806f9246d8 1de80c27-3b2f-47a6-91a7-e867cbe36462</userinput></screen>
+    <para>Create a consistency group from the snapshot of another consistency
+        group:
+    </para>
+    <screen>cinder consisgroup-create-from-src
+[--cgsnapshot <replaceable>CGSNAPSHOT</replaceable>]
+[--name <replaceable>NAME</replaceable>]
+[--description <replaceable>DESCRIPTION</replaceable>]</screen>
+    <para>The parameter <replaceable>CGSNAPSHOT</replaceable> is a name
+        or UUID of a snapshot of a consistency group.</para>
+    <screen><prompt>$</prompt> <userinput>cinder consisgroup-create-from-src --cgsnapshot 6d9dfb7d-079a-471e-b75a-6e9185ba0c38 --name 'new cg' --description 'new cg from cgsnapshot'</userinput></screen>
 </section>