diff -r 3d68bb0047a1 -r ec403cf308eb master/datagram_pair.h
--- a/master/datagram_pair.h	Tue Feb 12 15:30:34 2013 +0100
+++ b/master/datagram_pair.h	Tue Feb 12 15:46:43 2013 +0100
@@ -48,7 +48,7 @@
  */
 typedef struct {
     struct list_head list; /**< List header. */
-    ec_domain_t *domain;
+    ec_domain_t *domain; /**< Parent domain. */
     ec_datagram_t datagrams[EC_MAX_NUM_DEVICES]; /**< Datagrams.  */
 #if EC_MAX_NUM_DEVICES > 1
     uint8_t *send_buffer;