diff --git a/common/rfb/Timer.h b/common/rfb/Timer.h
index 78687d1..15b5d03 100644
--- a/common/rfb/Timer.h
+++ b/common/rfb/Timer.h
@@ -1,4 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
+ * Copyright 2018 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -85,6 +86,11 @@
     //   Usually used with isStarted() to get the _current_ timeout.
     int getTimeoutMs();
 
+    // getRemainingMs
+    //   Determines how many milliseconds are left before the Timer
+    //   will timeout. Only valid for an active timer.
+    int getRemainingMs();
+
     // isBefore
     //   Determine whether the Timer will timeout before the specified time.
     bool isBefore(timeval other);