diff --git a/README.md b/README.md
index 2780066fcbd76f635e878275483a762bd008e5ae..0d98f620ef842f6e00a222d276788452f03dd079 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,7 @@ The `localisation_packet_type` indicates the structure of the payload. These typ
 
   * `type 0` : Universal GNSS localisation
   * `type 1` : Locally referenced localisation
+  * `type 2` : Inter-node proximity
 
 The `movement_id_presence_flag` must be set to 1 if the `movement_id` field is present in the packet.