diff --git a/xml/vk.xml b/xml/vk.xml
index bab82746..818e2bb2 100644
--- a/xml/vk.xml
+++ b/xml/vk.xml
@@ -3725,7 +3725,7 @@ server.
         <enum value="-10"   name="VK_ERROR_TOO_MANY_OBJECTS" comment="Too many objects of the type have already been created"/>
         <enum value="-11"   name="VK_ERROR_FORMAT_NOT_SUPPORTED" comment="Requested format is not supported on this device"/>
         <enum value="-12"   name="VK_ERROR_FRAGMENTED_POOL" comment="A requested pool allocation has failed due to fragmentation of the pool's memory"/>
-            <unused start="-12"/>
+            <unused start="-13" comment="This is the next unused available error code (negative value)"/> 
     </enums>
     <enums name="VkDynamicState" type="enum">
         <enum value="0"     name="VK_DYNAMIC_STATE_VIEWPORT"/>