diff --git a/TODO.txt b/TODO.txt
index 10b883002..200d184d1 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -26,8 +26,8 @@ NEXT:
   - DONE: power down Bluetooth on sleep notifcation / turn on, if clients are connected
   - DONE: keep list of clients that requested Blueooth to be active
   - DONE: Bluetooth is on iff at least one client did request it. delay off by 10 seconds
-  - add enum POWER_EVENTS {POWER_WILL_SLEEP, POWER_WILL_WAKE_UP);
-  - add register_for_power_management_notifictations( void (*callback)(POWER_EVENTS event)); to bt_control.h
+  - DONE: add enum POWER_EVENTS {POWER_WILL_SLEEP, POWER_WILL_WAKE_UP);
+  - DONE: add register_for_power_management_notifictations( void (*callback)(POWER_EVENTS event)); to bt_control.h
   - move core foundation power event code to bt_control_iphone.m
   - add sleep() to bt_control.h (assumption: no off -> sleep transition)
 
diff --git a/src/bt_control.h b/src/bt_control.h
index 92fe62a35..180c638c5 100644
--- a/src/bt_control.h
+++ b/src/bt_control.h
@@ -42,9 +42,15 @@
 
 #include <stdint.h>
 
+typedef enum {
+    POWER_WILL_SLEEP = 1,
+    POWER_WILL_WAKE_UP
+} POWER_NOTIFICATION_t;
+
 typedef struct {
     int          (*on)(void *config);     // <-- turn BT module on and configure
     int          (*off)(void *config);    // <-- turn BT module off
+    int          (*sleep)(void *config);   // <-- put BT module to sleep - only to be called after ON
     int          (*valid)(void *config);  // <-- test if hardware can be supported
     const char * (*name)(void *config);   // <-- return hardware name
 
@@ -53,4 +59,6 @@ typedef struct {
       */
     uint8_t *    (*next_command)(void *config); 
 
+    void         (*register_for_power_notifications)(void (*cb)(POWER_NOTIFICATION_t event));
+
 } bt_control_t;
diff --git a/src/bt_control_iphone.m b/src/bt_control_iphone.m
index 886d0d478..efc56719e 100644
--- a/src/bt_control_iphone.m
+++ b/src/bt_control_iphone.m
@@ -500,12 +500,17 @@ static int iphone_off (void *config){
     return 0;
 }
 
+static int iphone_sleep(void *config){
+    return iphone_off(config);
+}
 
 // single instance
 bt_control_t bt_control_iphone = {
     iphone_on,
     iphone_off,
+    iphone_sleep,
     iphone_valid,
     iphone_name,
-    NULL
+    NULL,   // custom init sequence
+    NULL    // register_for_power_notifications
 };