diff --git a/pjmedia/include/pjmedia-audiodev/audiotest.h b/pjmedia/include/pjmedia-audiodev/audiotest.h
index 8b4fc96..8da3cc1 100644
--- a/pjmedia/include/pjmedia-audiodev/audiotest.h
+++ b/pjmedia/include/pjmedia-audiodev/audiotest.h
@@ -57,6 +57,16 @@
     unsigned max_interval;
 
     /** 
+     * Average inter-frame arrival time, in milliseconds 
+     */
+    unsigned avg_interval;
+
+    /** 
+     * Standard deviation of inter-frame arrival time, in milliseconds 
+     */
+    unsigned dev_interval;
+
+    /** 
      * Maximum number of frame burst 
      */
     unsigned max_burst;