diff --git a/include/hidl/HidlSupport.h b/include/hidl/HidlSupport.h
index 826ca9f..4fbe826 100644
--- a/include/hidl/HidlSupport.h
+++ b/include/hidl/HidlSupport.h
@@ -701,6 +701,8 @@
         SYNC_CALLBACK_EXIT,
         ASYNC_CALLBACK_ENTRY,
         ASYNC_CALLBACK_EXIT,
+        PASSTHROUGH_ENTRY,
+        PASSTHROUGH_EXIT,
     };
 
     // Signature of the instrumentation callback function.