diff --git a/renderdoc/driver/vulkan/vk_common.h b/renderdoc/driver/vulkan/vk_common.h
index 1b1618aad..b3d381a00 100644
--- a/renderdoc/driver/vulkan/vk_common.h
+++ b/renderdoc/driver/vulkan/vk_common.h
@@ -24,6 +24,9 @@
 
 #pragma once
 
+// PORTABILITY - parts of the code that need to change/update to handle
+// portability between different GPU setups/capabilities etc
+
 // MULTIDEVICE - parts of the code that will need to be updated to support
 // multiple devices or queues.
 
diff --git a/renderdoc/driver/vulkan/wrappers/vk_device_funcs.cpp b/renderdoc/driver/vulkan/wrappers/vk_device_funcs.cpp
index aab883106..8fbefc467 100644
--- a/renderdoc/driver/vulkan/wrappers/vk_device_funcs.cpp
+++ b/renderdoc/driver/vulkan/wrappers/vk_device_funcs.cpp
@@ -48,7 +48,7 @@ void WrappedVulkan::Initialise(VkInitParams &params)
 	params.AppName = string("RenderDoc @ ") + params.AppName;
 	params.EngineName = string("RenderDoc @ ") + params.EngineName;
 
-	// VKTODOLOW verify that layers/extensions are available
+	// PORTABILITY verify that layers/extensions are available
 
 	// don't try and create our own layer on replay!
 	for(auto it = params.Layers.begin(); it != params.Layers.end(); ++it)
@@ -280,7 +280,7 @@ bool WrappedVulkan::Serialise_vkEnumeratePhysicalDevices(
 		vkr = ObjDisp(instance)->EnumeratePhysicalDevices(Unwrap(instance), &count, devices);
 		RDCASSERT(vkr == VK_SUCCESS);
 
-		// VKTODOLOW match up physical devices to those available on replay
+		// PORTABILITY match up physical devices to those available on replay
 
 		pd = devices[physIndex];
 
@@ -534,7 +534,7 @@ bool WrappedVulkan::Serialise_vkCreateDevice(
 		else
 			RDCWARN("tessellationSideEffects = false, Tess output mesh data will not be available");
 
-		// VKTODOLOW: check that extensions and layers supported in capture (from createInfo) are supported in replay
+		// PORTABILITY check that extensions and layers supported in capture (from createInfo) are supported in replay
 
 		VkResult ret = GetDeviceDispatchTable(NULL)->CreateDevice(Unwrap(physicalDevice), &createInfo, &device);
 
diff --git a/renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp b/renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp
index fac1e7a3a..43dbc7fa3 100644
--- a/renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp
+++ b/renderdoc/driver/vulkan/wrappers/vk_resource_funcs.cpp
@@ -156,7 +156,7 @@ bool WrappedVulkan::Serialise_vkAllocMemory(
 		device = GetResourceManager()->GetLiveHandle<VkDevice>(devId);
 
 		// serialised memory type index is non-remapped, so we remap now.
-		// VKTODOLOW may need to re-write info to change memory type index to the
+		// PORTABILITY may need to re-write info to change memory type index to the
 		// appropriate index on replay
 		info.memoryTypeIndex = m_PhysicalDeviceData.memIdxMap[info.memoryTypeIndex];