diff --git a/xml/vk.xml b/xml/vk.xml
index b3a939bcc..1b5630e72 100644
--- a/xml/vk.xml
+++ b/xml/vk.xml
@@ -8776,7 +8776,7 @@ typedef void* <name>MTLSharedEvent_id</name>;
         <type category="struct" name="VkLatencySurfaceCapabilitiesNV" structextends="VkSurfaceCapabilities2KHR">
             <member values="VK_STRUCTURE_TYPE_LATENCY_SURFACE_CAPABILITIES_NV"><type>VkStructureType</type> <name>sType</name></member>
             <member optional="true">const <type>void</type>*                              <name>pNext</name></member>
-            <member optional="false,true"><type>uint32_t</type>                           <name>presentModeCount</name></member>
+            <member optional="true"><type>uint32_t</type>                                 <name>presentModeCount</name></member>
             <member optional="true" len="presentModeCount"><type>VkPresentModeKHR</type>* <name>pPresentModes</name></member>
         </type>
     </types>
@@ -13748,7 +13748,7 @@ typedef void* <name>MTLSharedEvent_id</name>;
             <param><type>VkDevice</type> <name>device</name></param>
             <param><type>VkFaultQueryBehavior</type> <name>faultQueryBehavior</name></param>
             <param><type>VkBool32</type>* <name>pUnrecordedFaults</name></param>
-            <param><type>uint32_t</type>* <name>pFaultCount</name></param>
+            <param optional="false,true"><type>uint32_t</type>* <name>pFaultCount</name></param>
             <param optional="true" len="pFaultCount"><type>VkFaultData</type>* <name>pFaults</name></param>
         </command>
         <command successcodes="VK_SUCCESS,VK_INCOMPLETE" errorcodes="VK_ERROR_OUT_OF_HOST_MEMORY">
@@ -22683,8 +22683,8 @@ typedef void* <name>MTLSharedEvent_id</name>;
                 <command name="vkCmdBindIndexBuffer2KHR"/>
                 <command name="vkGetRenderingAreaGranularityKHR"/>
                 <type name="VkRenderingAreaInfoKHR"/>
-                <command name ="vkGetDeviceImageSubresourceLayoutKHR"/>
-                <command name ="vkGetImageSubresourceLayout2KHR"/>
+                <command name="vkGetDeviceImageSubresourceLayoutKHR"/>
+                <command name="vkGetImageSubresourceLayout2KHR"/>
                 <type name="VkDeviceImageSubresourceInfoKHR"/>
                 <type name="VkImageSubresource2KHR"/>
                 <type name="VkSubresourceLayout2KHR"/>