diff --git a/apple/iOS/bluetooth/btstack/linked_list.h b/apple/iOS/bluetooth/btstack/linked_list.h
index 803564ef81..d2abcf147d 100644
--- a/apple/iOS/bluetooth/btstack/linked_list.h
+++ b/apple/iOS/bluetooth/btstack/linked_list.h
@@ -35,21 +35,28 @@
 #if defined __cplusplus
 extern "C" {
 #endif
-	
-typedef struct linked_item {
-    struct linked_item *next; // <-- next element in list, or NULL
-    void *user_data;          // <-- pointer to struct base
-} linked_item_t;
 
 typedef linked_item_t * linked_list_t;
+	
+typedef struct linked_item
+{
+   struct linked_item *next; /* <-- next element in list, or NULL */
+   void *user_data;          /* <-- pointer to struct base */
+} linked_item_t;
+
+void linked_item_set_user(linked_item_t *item, void *user_data);        /* <-- set user data */
+
+void * linked_item_get_user(linked_item_t *item);                       /* <-- get user data */
 
-void linked_item_set_user(linked_item_t *item, void *user_data);        // <-- set user data
-void * linked_item_get_user(linked_item_t *item);                       // <-- get user data
 int  linked_list_empty(linked_list_t * list);
-void linked_list_add(linked_list_t * list, linked_item_t *item);        // <-- add item to list as first element
-void linked_list_add_tail(linked_list_t * list, linked_item_t *item);   // <-- add item to list as last element
-int  linked_list_remove(linked_list_t * list, linked_item_t *item);     // <-- remove item from list
-linked_item_t * linked_list_get_last_item(linked_list_t * list);        // <-- find the last item in the list
+
+void linked_list_add(linked_list_t * list, linked_item_t *item);        /* <-- add item to list as first element */
+
+void linked_list_add_tail(linked_list_t * list, linked_item_t *item);   /* <-- add item to list as last element */
+
+int  linked_list_remove(linked_list_t * list, linked_item_t *item);     /* <-- remove item from list */
+
+linked_item_t * linked_list_get_last_item(linked_list_t * list);        /* <-- find the last item in the list */
 
 void test_linked_list(void);