diff --git a/tlv.h b/tlv.h
index 75c9703..9c90bca 100644
--- a/tlv.h
+++ b/tlv.h
@@ -14,21 +14,26 @@ typedef union tlv {
 	warning *warning;
 } tlv;
 
+
+// 1 octet
 typedef struct pad1 {
 	unsigned unsigned char type;
 } pad1;
 
+// 2 octets min, 257 octets max (unsigned char 0 -> 255)
 typedef struct padn {
 	unsigned char type;
 	unsigned char length;
 	char *mbz;
 } padn;
 
+// 2 octets
 typedef struct neighbour_req {
 	unsigned char type;
 	unsigned char length;
 } neighbour_req;
 
+// 132 octets
 typedef struct neighbour {
 	unsigned char type;
 	unsigned char length;
@@ -36,17 +41,20 @@ typedef struct neighbour {
 	short port;
 } neighbour;
 
+// 18 octets
 typedef struct network_hash {
 	unsigned char type;
 	unsigned char length;
 	char *network_hash;
 } network_hash;
 
+// 2 octets
 typedef struct network_state_req {
 	unsigned char type;
 	unsigned char length;
 } network_state_req;
 
+// 28 octets
 typedef struct node_hash {
 	unsigned char type;
 	unsigned char length;
@@ -55,12 +63,14 @@ typedef struct node_hash {
 	char *node_hash;
 } node_hash;
 
+// 10 octets
 typedef struct node_state_req {
 	unsigned char type;
 	unsigned char length;
 	long node_id;
 } node_state_req;
 
+// 28 octets min, 220 octets max (data 0 -> 192)
 typedef struct node_state {
 	unsigned char type;
 	unsigned char length;
@@ -70,9 +80,9 @@ typedef struct node_state {
 	char *data;
 } node_state;
 
+// 2 octets min, 257 ocets max (unsigned char 0 -> 255)
 typedef struct warning {
 	unsigned char type;
 	unsigned char length;
 	char *message;
-} warning;
-
+} warning;
\ No newline at end of file