cosmetic: some more comments
diff --git a/src/protocol.h b/src/protocol.h
index 21601ce..f4aff77 100644
--- a/src/protocol.h
+++ b/src/protocol.h
@@ -19,6 +19,10 @@
  * 25 64 00 6C 31 5F 61 63 71 2E 63 00                %d.l1_acq.c.
  */
 
+/***********************************************************************
+ * Extended Message Service (DIAG_EXT_MSG_F)
+ ***********************************************************************/
+
 struct ext_log_msg {
 	/* msg_hdr_type equivalent */
 	uint8_t		type;
@@ -61,6 +65,10 @@
 } __attribute__((packed));
 
 
+/***********************************************************************
+ * Log Service (IAG_LOG_F)
+ ***********************************************************************/
+
 /* message header for DIAG_LOG_F */
 struct diag_log_hdr {
 	uint8_t		cmd_code;
@@ -77,6 +85,10 @@
 } __attribute__((packed));
 
 
+/***********************************************************************
+ * Command  Service (DIAG_SUBSYS_CMD_F)
+ ***********************************************************************/
+
 /* extended DIAG packet, */
 struct diagpkt_subsys_hdr {
 	uint8_t		command;	/* DIAG_SUBSYS_CMD_F */
diff --git a/src/qmi_decode.c b/src/qmi_decode.c
index 23af90e..dec48a4 100644
--- a/src/qmi_decode.c
+++ b/src/qmi_decode.c
@@ -3,6 +3,8 @@
 
 #include <libqmi-glib.h>
 
+/* A small wrapper around libqmi-glib to give us a human-readable string
+ * representation of QMI messages that we receive from DIAG */
 int dump_qmi_msg(const uint8_t *data, unsigned int len)
 {
 	GByteArray *buffer;