diff --git a/doc/config-reference/block-storage/drivers/vmware-vmdk-driver.xml b/doc/config-reference/block-storage/drivers/vmware-vmdk-driver.xml
index 2669e3b07c..97c3f2323e 100644
--- a/doc/config-reference/block-storage/drivers/vmware-vmdk-driver.xml
+++ b/doc/config-reference/block-storage/drivers/vmware-vmdk-driver.xml
@@ -248,6 +248,16 @@
           </listitem>
           <listitem>
             <para>Copy an image to a volume.</para>
+            <note>
+                <para>Only images in <literal>vmdk</literal> disk format
+                    with <literal>bare</literal> container format are
+                    supported. The <option>vmware_disktype</option> property
+                    of the image can be <literal>preallocated</literal>,
+                    <literal>sparse</literal>,
+                    <literal>streamOptimized</literal> or
+                    <literal>thin</literal>.
+                </para>
+            </note>
           </listitem>
           <listitem>
             <para>Copy a volume to an image. (Allowed only if volume is not