diff --git a/kubi-server/src/auth.rs b/kubi-server/src/auth.rs
index eb2b634..5a376a0 100644
--- a/kubi-server/src/auth.rs
+++ b/kubi-server/src/auth.rs
@@ -35,10 +35,12 @@ pub fn authenticate_players(
 
       //Spawn the user
       //  TODO
-      
+
       //Approve the user
       server.0.send_message(*from, ServerToClientMessage::ServerHello {
-        init: InitData {}
+        init: InitData {
+          users: todo!()
+        }
       }).map_err(log_error).ok();
     }
   }
diff --git a/kubi-shared/src/networking/messages.rs b/kubi-shared/src/networking/messages.rs
index 95b7b16..0b553c6 100644
--- a/kubi-shared/src/networking/messages.rs
+++ b/kubi-shared/src/networking/messages.rs
@@ -1,3 +1,5 @@
+use std::num::NonZeroUsize;
+
 use bincode::{Encode, Decode};
 use crate::chunk::BlockData;
 
@@ -23,9 +25,18 @@ pub enum ClientToServerMessage {
   },
 }
 
+#[derive(Encode, Decode, Clone)]
+pub struct UserInitData {
+  pub client_id: NonZeroUsize, //maybe use the proper type instead
+  pub username: String,
+  pub position: Vec3Arr,
+  pub velocity: Vec3Arr,
+  pub direction: QuatArr,
+}
+
 #[derive(Encode, Decode, Clone)]
 pub struct InitData {
-  
+  pub users: Vec<UserInitData>
 }
 
 #[derive(Encode, Decode, Clone)]
diff --git a/kubi-udp/src/lib.rs b/kubi-udp/src/lib.rs
index ae5678c..82588e3 100644
--- a/kubi-udp/src/lib.rs
+++ b/kubi-udp/src/lib.rs
@@ -4,6 +4,7 @@ pub(crate) mod packet;
 pub(crate) mod common;
 pub use common::ClientId;
 pub use common::ClientIdRepr;
+pub use common::MAX_CLIENTS;
 
 //pub(crate) trait Serializable: bincode::Encode + bincode::Decode {}
 pub(crate) const BINCODE_CONFIG: bincode::config::Configuration<bincode::config::LittleEndian, bincode::config::Varint, bincode::config::SkipFixedArrayLength> = bincode::config::standard()