diff --git a/src/xrt/auxiliary/vk/vk_helpers.c b/src/xrt/auxiliary/vk/vk_helpers.c
index e38c58747..e85f493ab 100644
--- a/src/xrt/auxiliary/vk/vk_helpers.c
+++ b/src/xrt/auxiliary/vk/vk_helpers.c
@@ -598,6 +598,27 @@ vk_surface_transform_flag_string(VkSurfaceTransformFlagBitsKHR bits, bool null_o
 	}
 }
 
+#ifdef VK_KHR_display
+XRT_CHECK_RESULT const char *
+vk_display_plane_alpha_flag_string(VkDisplayPlaneAlphaFlagBitsKHR bits, bool null_on_unknown)
+{
+	switch (bits) {
+		ENUM_TO_STR(VK_DISPLAY_PLANE_ALPHA_OPAQUE_BIT_KHR);
+		ENUM_TO_STR(VK_DISPLAY_PLANE_ALPHA_GLOBAL_BIT_KHR);
+		ENUM_TO_STR(VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_BIT_KHR);
+		ENUM_TO_STR(VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_PREMULTIPLIED_BIT_KHR);
+	default:
+		if (bits == 0) {
+			return "DISPLAY PLANE ALPHA: NO BITS SET";
+		} else if (bits & (bits - 1)) {
+			return "DISPLAY PLANE ALPHA: MULTIPLE BITS SET";
+		} else {
+			return null_on_unknown ? NULL : "DISPLAY PLANE ALPHA: UNKNOWN BIT";
+		}
+	}
+}
+#endif
+
 XRT_CHECK_RESULT const char *
 xrt_swapchain_usage_flag_string(enum xrt_swapchain_usage_bits bits, bool null_on_unknown)
 {
diff --git a/src/xrt/auxiliary/vk/vk_helpers.h b/src/xrt/auxiliary/vk/vk_helpers.h
index feb8f2f33..cb4965bf0 100644
--- a/src/xrt/auxiliary/vk/vk_helpers.h
+++ b/src/xrt/auxiliary/vk/vk_helpers.h
@@ -496,6 +496,15 @@ vk_composite_alpha_flag_string(VkCompositeAlphaFlagBitsKHR bits, bool null_on_un
 XRT_CHECK_RESULT const char *
 vk_surface_transform_flag_string(VkSurfaceTransformFlagBitsKHR bits, bool null_on_unknown);
 
+#ifdef VK_KHR_display
+/*!
+ * Returns the display plane alpha flag if one valid bit is set,
+ * if multiple bits are set, will return 'MULTIPLE BIT SET'.
+ */
+XRT_CHECK_RESULT const char *
+vk_display_plane_alpha_flag_string(VkDisplayPlaneAlphaFlagBitsKHR bits, bool null_on_unknown);
+#endif
+
 /*!
  * Returns xrt swapchain_usage flag if one valid bit is set,
  * if multiple bits are set, will return 'MULTIPLE BIT SET'.