vscard_common: Header comment updated

1 files changed, 5 insertions, 2 deletions

diff --git a/vscard_common.h b/vscard_common.h
index b78f487..cd79ca3 100644
--- a/vscard_common.h
+++ b/vscard_common.h
@@ -79,8 +79,11 @@ typedef uint32_t reader_id_t;
 #define VSCARD_MAGIC (*(uint32_t*)"VSCD")
 
 /* Header
- * Each message starts with the header. The reader_id
- * value is only relevant
+ * Each message starts with the header.
+ * type - message type
+ * reader_id - used by messages that are reader specific
+ * length - length of payload (not including header, i.e. zero for
+ *  messages containing empty payloads)
  */
 typedef struct VSCMsgHeader {
     uint32_t   type;