diff --git a/Microsoft.O365.Security.Native.ETW/EventRecordMetadata.hpp b/Microsoft.O365.Security.Native.ETW/EventRecordMetadata.hpp
index 2d07f42..2af4662 100644
--- a/Microsoft.O365.Security.Native.ETW/EventRecordMetadata.hpp
+++ b/Microsoft.O365.Security.Native.ETW/EventRecordMetadata.hpp
@@ -28,6 +28,9 @@ namespace Microsoft { namespace O365 { namespace Security { namespace ETW {
 
         EventRecordMetadata() { }
 
+        /// <summary>
+        /// Update the underlying pointers to the event data to the given record.
+        /// </summary>
         virtual void Update(const EVENT_RECORD& record)
         {
             record_ = &record;