diff --git a/docs/schemas/capability.rng b/docs/schemas/capability.rng
index 1e3c5f3509..dbfe1c5093 100644
--- a/docs/schemas/capability.rng
+++ b/docs/schemas/capability.rng
@@ -79,6 +79,8 @@
 	  <oneOrMore>
 	    <element name='uri_transport'>
 	      <choice>
+		<value>esx</value>
+		<value>tcp</value>
 		<value>xenmigr</value>
 	      </choice>
 	    </element>