Update README.md

README.md

@@ -53,6 +53,8 @@ The `movement_id_presence_flag` must be set to 1 if the `movement_id` field is p
 
 #### Type 0 : Universal GNSS localisation
 
+Transport of GNSS coordinates.
+
 ##### Payload general structure
 
 |    1B    |     4B      |     4B      |    0/4B    | 0/4B  |
@@ -78,3 +80,10 @@ The `altitude_presence_flag` must be set to 1 if the `altitude` field is present
 The `dop_presence_flag` must be set to 1 if the `dop` field is present in the packet.
 
 #### Type 1 : Locally referenced localisation
+
+Transport of locally referenced localisation
+
+#### Type 2 : Inter-node proximity
+
+Transport of raw distances (rangings) between pairs of nodes
+