diff --git a/lib/include/maca.h b/lib/include/maca.h
index 5eda1d44a..5f3cdb788 100644
--- a/lib/include/maca.h
+++ b/lib/include/maca.h
@@ -29,7 +29,7 @@ volatile packet_t* get_free_packet(void);
 void free_packet(volatile packet_t *p);
 void free_all_packets(void);
 
-extern volatile packet_t *rx_head;
+extern volatile packet_t *rx_head, *tx_head;
 
 extern void maca_rx_callback(volatile packet_t *p) __attribute__((weak));
 extern void maca_tx_callback(volatile packet_t *p) __attribute__((weak));
@@ -152,6 +152,7 @@ enum {
 #define MACA_KEY0       ((volatile uint32_t *) (MACA_BASE+0x164))
 #define MACA_OPTIONS    ((volatile uint32_t *) (MACA_BASE+0x180))
 
+
 /******************************************************************************/
 /* everything under this comment is messy, needs cleaning, and will           */
 /* probably change in the future                                              */
diff --git a/lib/maca.c b/lib/maca.c
index 8efc89538..58724bac6 100644
--- a/lib/maca.c
+++ b/lib/maca.c
@@ -27,12 +27,12 @@
 #define reg(x) (*(volatile uint32_t *)(x))
 
 static volatile packet_t packet_pool[NUM_PACKETS];
-static volatile packet_t *free_head, *rx_end, *tx_head, *tx_end, *dma_tx, *dma_rx = 0;
+static volatile packet_t *free_head, *rx_end, *tx_end, *dma_tx, *dma_rx = 0;
 
-/* rx_head is visible to the outside */
+/* rx_head and tx_head are visible to the outside */
 /* so you can peek at it and see if there is data */
-/* waiting for you */
-volatile packet_t *rx_head;
+/* waiting for you, or data still to be sent */
+volatile packet_t *rx_head, *tx_head;
 
 /* used for ack recpetion if the packet_pool goes empty */
 /* doesn't go back into the pool when freed */