diff --git a/API-Implementation.md b/API-Implementation.md
index 7d7d962..c2c6517 100644
--- a/API-Implementation.md
+++ b/API-Implementation.md
@@ -17,10 +17,11 @@ Sent individually, as needed.
 #### heartbeat
 Sent all together, every 1 sec.
 ```xml
-<heartbeat>
-<wss>
-<max_wss>
-<network_suspended>
+<heartbeat/>
+<wss>...
+<max_wss>...
+<network_suspended/>
+[ <sporadic_ca>... ]
 ```
 
 #### trickle_down
@@ -42,6 +43,7 @@ Sent together, every 1 sec or when boinc_report_app_status() called by app
 [<other_pid>... ]
 [<bytes_sent>...]
 [<bytes_received>...]
+[<sporadic_ac>...]
 ```
 
 #### trickle_up