diff --git a/Docs/Whats_New.md b/Docs/Whats_New.md
index 1052169..48081c1 100644
--- a/Docs/Whats_New.md
+++ b/Docs/Whats_New.md
@@ -19,6 +19,10 @@
 Released TBD
 
 - Add support for extensions:
+	- `VK_KHR_external_fence` (non-functional groundwork for future extensions,
+	  including support for GCD and Mach semaphores)
+	- `VK_KHR_external_fence_capabilities` (non-functional groundwork for future
+	  extensions, including support for GCD and Mach semaphores)
 	- `VK_KHR_multiview`
 - Improve performance of tessellation control pipeline stage by processing multiple 
   patches per workgroup.
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.h b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.h
index a419f30..deabd83 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.h
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.h
@@ -137,6 +137,10 @@
 	void getExternalBufferProperties(const VkPhysicalDeviceExternalBufferInfo* pExternalBufferInfo,
 									 VkExternalBufferProperties* pExternalBufferProperties);
 
+	/** Populates the external fence properties supported on this device. */
+	void getExternalFenceProperties(const VkPhysicalDeviceExternalFenceInfo* pExternalFenceInfo,
+									VkExternalFenceProperties* pExternalFenceProperties);
+
 #pragma mark Surfaces
 
 	/**
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
index e3c0634..ceb59c0 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
@@ -594,6 +594,15 @@
 	}
 }
 
+static const VkExternalFenceProperties _emptyExtFenceProps = {VK_STRUCTURE_TYPE_EXTERNAL_FENCE_PROPERTIES, nullptr, 0, 0, 0};
+
+void MVKPhysicalDevice::getExternalFenceProperties(const VkPhysicalDeviceExternalFenceInfo* pExternalFenceInfo,
+												   VkExternalFenceProperties* pExternalFenceProperties) {
+	void* next = pExternalFenceProperties->pNext;
+	*pExternalFenceProperties = _emptyExtFenceProps;
+	pExternalFenceProperties->pNext = next;
+}
+
 
 #pragma mark Surfaces
 
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKInstance.mm b/MoltenVK/MoltenVK/GPUObjects/MVKInstance.mm
index 48c6c48..851643e 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKInstance.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKInstance.mm
@@ -557,6 +557,8 @@
 
 	// Instance extension functions:
 	ADD_INST_EXT_ENTRY_POINT(vkEnumeratePhysicalDeviceGroupsKHR, KHR_DEVICE_GROUP_CREATION);
+	ADD_INST_EXT_ENTRY_POINT(vkGetPhysicalDeviceExternalFencePropertiesKHR, KHR_EXTERNAL_FENCE_CAPABILITIES);
+	ADD_INST_EXT_ENTRY_POINT(vkGetPhysicalDeviceExternalBufferPropertiesKHR, KHR_EXTERNAL_MEMORY_CAPABILITIES);
 	ADD_INST_EXT_ENTRY_POINT(vkGetPhysicalDeviceFeatures2KHR, KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2);
 	ADD_INST_EXT_ENTRY_POINT(vkGetPhysicalDeviceProperties2KHR, KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2);
 	ADD_INST_EXT_ENTRY_POINT(vkGetPhysicalDeviceFormatProperties2KHR, KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2);
diff --git a/MoltenVK/MoltenVK/Layers/MVKExtensions.def b/MoltenVK/MoltenVK/Layers/MVKExtensions.def
index 0caca71..3b73870 100644
--- a/MoltenVK/MoltenVK/Layers/MVKExtensions.def
+++ b/MoltenVK/MoltenVK/Layers/MVKExtensions.def
@@ -47,6 +47,8 @@
 MVK_EXTENSION(KHR_device_group, KHR_DEVICE_GROUP, DEVICE)
 MVK_EXTENSION(KHR_device_group_creation, KHR_DEVICE_GROUP_CREATION, INSTANCE)
 MVK_EXTENSION(KHR_driver_properties, KHR_DRIVER_PROPERTIES, DEVICE)
+MVK_EXTENSION(KHR_external_fence, KHR_EXTERNAL_FENCE, DEVICE)
+MVK_EXTENSION(KHR_external_fence_capabilities, KHR_EXTERNAL_FENCE_CAPABILITIES, INSTANCE)
 MVK_EXTENSION(KHR_external_memory, KHR_EXTERNAL_MEMORY, DEVICE)
 MVK_EXTENSION(KHR_external_memory_capabilities, KHR_EXTERNAL_MEMORY_CAPABILITIES, INSTANCE)
 MVK_EXTENSION(KHR_get_memory_requirements2, KHR_GET_MEMORY_REQUIREMENTS_2, DEVICE)
diff --git a/MoltenVK/MoltenVK/Vulkan/vulkan.mm b/MoltenVK/MoltenVK/Vulkan/vulkan.mm
index b84a88c..a35932e 100644
--- a/MoltenVK/MoltenVK/Vulkan/vulkan.mm
+++ b/MoltenVK/MoltenVK/Vulkan/vulkan.mm
@@ -2034,6 +2034,36 @@
 
 
 #pragma mark -
+#pragma mark VK_KHR_external_fence_capabilities extension
+
+MVK_PUBLIC_SYMBOL void vkGetPhysicalDeviceExternalFencePropertiesKHR(
+	VkPhysicalDevice                            physicalDevice,
+	const VkPhysicalDeviceExternalFenceInfo*    pExternalFenceInfo,
+	VkExternalFenceProperties*                  pExternalFenceProperties) {
+
+	MVKTraceVulkanCallStart();
+	MVKPhysicalDevice* mvkPD = MVKPhysicalDevice::getMVKPhysicalDevice(physicalDevice);
+	mvkPD->getExternalFenceProperties(pExternalFenceInfo, pExternalFenceProperties);
+	MVKTraceVulkanCallEnd();
+}
+
+
+#pragma mark -
+#pragma mark VK_KHR_external_memory_capabilities extension
+
+MVK_PUBLIC_SYMBOL void vkGetPhysicalDeviceExternalBufferPropertiesKHR(
+	VkPhysicalDevice                            physicalDevice,
+	const VkPhysicalDeviceExternalBufferInfo*   pExternalBufferInfo,
+	VkExternalBufferProperties*                 pExternalBufferProperties) {
+
+	MVKTraceVulkanCallStart();
+	MVKPhysicalDevice* mvkPD = MVKPhysicalDevice::getMVKPhysicalDevice(physicalDevice);
+	mvkPD->getExternalBufferProperties(pExternalBufferInfo, pExternalBufferProperties);
+	MVKTraceVulkanCallEnd();
+}
+
+
+#pragma mark -
 #pragma mark VK_KHR_get_memory_requirements2 extension
 
 MVK_PUBLIC_SYMBOL void vkGetBufferMemoryRequirements2KHR(
@@ -2717,21 +2747,6 @@
 
 
 #pragma mark -
-#pragma mark VK_KHR_external_memory_capabilities extension
-
-MVK_PUBLIC_SYMBOL void vkGetPhysicalDeviceExternalBufferPropertiesKHR(
-	VkPhysicalDevice                            physicalDevice,
-	const VkPhysicalDeviceExternalBufferInfo*   pExternalBufferInfo,
-	VkExternalBufferProperties*                 pExternalBufferProperties) {
-
-	MVKTraceVulkanCallStart();
-	MVKPhysicalDevice* mvkPD = MVKPhysicalDevice::getMVKPhysicalDevice(physicalDevice);
-	mvkPD->getExternalBufferProperties(pExternalBufferInfo, pExternalBufferProperties);
-	MVKTraceVulkanCallEnd();
-}
-
-
-#pragma mark -
 #pragma mark VK_EXT_metal_surface extension
 
 MVK_PUBLIC_SYMBOL VkResult vkCreateMetalSurfaceEXT(