diff --git a/xml/cl.xml b/xml/cl.xml
index 9f947989b..e27963850 100644
--- a/xml/cl.xml
+++ b/xml/cl.xml
@@ -4445,6 +4445,14 @@ server's OpenCL/api-docs repository.
             <enum name="CL_SUBMITTED"/>
             <enum name="CL_QUEUED"/>
         </require>
+        <require comment="cl_khronos_vendor_id">
+            <!-- The cl_khronos_vendor_id type was added in OpenCL 3.0, but the
+                 concept of assigned vendor IDs has existed since OpenCL 1.0.
+                 These enums can be used in any OpenCL version because the type
+                 used in the API is cl_uint. -->
+            <enum name="CL_KHRONOS_VENDOR_ID_CODEPLAY"/>
+            <enum name="CL_KHRONOS_VENDOR_ID_POCL"/>
+        </require>
         <require comment="Platform APIs">
             <command name="clGetPlatformIDs"/>
             <command name="clGetPlatformInfo"/>