diff --git a/brandt.c b/brandt.c
index 50ccb67..06aff3d 100644
--- a/brandt.c
+++ b/brandt.c
@@ -185,7 +185,7 @@ seller_start (void *arg)
 
 struct BRANDT_Auction *
 BRANDT_new (BRANDT_CbResult             result,
-            BRANDT_CbBroadcast          broadcast,
+            BRANDT_CbDeliver            broadcast,
             BRANDT_CbStart              start,
             void                        *auction_closure,
             void                        **auction_desc,
@@ -283,13 +283,13 @@ BRANDT_parse_desc (const void                  *auction_desc,
 
 
 struct BRANDT_Auction *
-BRANDT_join (BRANDT_CbResult    result,
-             BRANDT_CbBroadcast broadcast,
-             BRANDT_CbUnicast   unicast,
-             void               *auction_closure,
-             const void         *auction_desc,
-             size_t             auction_desc_len,
-             uint16_t           bid)
+BRANDT_join (BRANDT_CbResult  result,
+             BRANDT_CbDeliver broadcast,
+             BRANDT_CbDeliver unicast,
+             void             *auction_closure,
+             const void       *auction_desc,
+             size_t           auction_desc_len,
+             uint16_t         bid)
 {
 	struct BRANDT_Auction *ret = GNUNET_new (struct BRANDT_Auction);
 
diff --git a/brandt.h b/brandt.h
index 3029031..f441f00 100644
--- a/brandt.h
+++ b/brandt.h
@@ -68,36 +68,22 @@ typedef uint16_t
 
 
 /**
- * Functions of this type are called by libbrandt to broadcast messages to the
- * blackboard of a specific auction. They have to be sent using authenticated
- * encryption.
+ * Functions of this type are called by libbrandt to deliver messages to other
+ * participants of an auction. There are two variants how this Callback needs to
+ * be implemented. The first is delivering messages as unicast directly to the
+ * seller, the second is delivering messages as broadcast to all participants
+ * (bidders + seller). All messages need to be authenticated and encrypted
+ * before sending and the signature needs to be checked immediately after
+ * receipt.
  *
  * @param[in] auction_closure Closure pointer representing the respective
- * auction. This is the Pointer given to BRANDT_join().
- * @param[in] msg The message to be broadcast to all participants of
- * @a auction_closure.
+ * auction. This is the Pointer given to BRANDT_join() / BRANDT_new().
+ * @param[in] msg The message to be delivered
  * @param[in] msg_len The length of the message @a msg in bytes.
  * @return 0 on success, -1 on failure.
  */
 typedef int
-(*BRANDT_CbBroadcast)(void       *auction_closure,
-                      const void *msg,
-                      size_t     msg_len);
-
-
-/**
- * Functions of this type are called by libbrandt to unicast messages to the
- * seller of a specific auction. They have to be sent using authenticated
- * encryption.
- *
- * @param[in] auction_closure Closure pointer representing the respective
- * auction. This is the Pointer given to BRANDT_join().
- * @param[in] msg The message to be sent to the seller of @a auction_closure.
- * @param[in] msg_len The length of the message @a msg in bytes.
- * @return 0 on success, -1 on failure.
- */
-typedef int
-(*BRANDT_CbUnicast)(void       *auction_closure,
+(*BRANDT_CbDeliver)(void       *auction_closure,
                     const void *msg,
                     size_t     msg_len);
 
@@ -166,13 +152,13 @@ BRANDT_parse_desc (const void                  *auction_desc,
  * black-box pointer, do NOT dereference/change it or the data it points to!
  */
 struct BRANDT_Auction *
-BRANDT_join (BRANDT_CbResult    result,
-             BRANDT_CbBroadcast broadcast,
-             BRANDT_CbUnicast   unicast,
-             void               *auction_closure,
-             const void         *auction_desc,
-             size_t             auction_desc_len,
-             uint16_t           bid);
+BRANDT_join (BRANDT_CbResult  result,
+             BRANDT_CbDeliver broadcast,
+             BRANDT_CbDeliver unicast,
+             void             *auction_closure,
+             const void       *auction_desc,
+             size_t           auction_desc_len,
+             uint16_t         bid);
 
 
 /* \todo: have cancellation (BRANDT_join_cancel()) */
@@ -208,7 +194,7 @@ BRANDT_join (BRANDT_CbResult    result,
  */
 struct BRANDT_Auction *
 BRANDT_new (BRANDT_CbResult             result,
-            BRANDT_CbBroadcast          broadcast,
+            BRANDT_CbDeliver            broadcast,
             BRANDT_CbStart              start,
             void                        *auction_closure,
             void                        **auction_desc,
diff --git a/internals.h b/internals.h
index d6de9db..8a82e2e 100644
--- a/internals.h
+++ b/internals.h
@@ -110,10 +110,10 @@ struct BRANDT_Auction {
 
 	void *closure;              /** auction closure given by the user */
 
-	BRANDT_CbResult    result;  /** result reporting callback */
-	BRANDT_CbBroadcast bcast;   /** broadcast callback */
-	BRANDT_CbUnicast   ucast;   /** unicast callback */
-	BRANDT_CbStart     start;   /** start callback */
+	BRANDT_CbResult  result;    /** result reporting callback */
+	BRANDT_CbDeliver bcast;     /** broadcast callback */
+	BRANDT_CbDeliver ucast;     /** unicast callback */
+	BRANDT_CbStart   start;     /** start callback */
 
 	int         seller_mode;    /** If 0 we are bidding, selling otherwise */
 	enum rounds cur_round;      /** The round we expect messages from */