diff --git a/common/src/comp/presence.rs b/common/src/comp/presence.rs
index a57620e3cc..7148d220a7 100644
--- a/common/src/comp/presence.rs
+++ b/common/src/comp/presence.rs
@@ -34,9 +34,9 @@ impl Component for Presence {
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PresenceKind {
     Spectator,
-    // Note: we don't know if this character ID is valid and associated with the respective player
-    // until it the character has loaded successfully. The ID should only be trusted and included
-    // in the mapping when the variant changed to `Character`.
+    // Note: we don't know if this character ID is valid and associated with the player until the
+    // character has loaded successfully. The ID should only be trusted and included in the
+    // mapping when the variant is changed to `Character`.
     LoadingCharacter(CharacterId),
     Character(CharacterId),
     Possessor,
diff --git a/server/src/events/entity_creation.rs b/server/src/events/entity_creation.rs
index 3654097a05..0503ad7f1f 100644
--- a/server/src/events/entity_creation.rs
+++ b/server/src/events/entity_creation.rs
@@ -18,7 +18,7 @@ use common::{
     outcome::Outcome,
     resources::{Secs, Time},
     rtsim::RtSimVehicle,
-    uid::Uid,
+    uid::{IdMaps, Uid},
     util::Dir,
     vol::IntoFullVolIterator,
     ViewDistances,
@@ -140,7 +140,7 @@ pub fn handle_create_npc(server: &mut Server, pos: Pos, mut npc: NpcBuilder) ->
         entity
     };
 
-    // TODO: rtsim entity added here
+    // Rtsim entity added to IdMaps below.
     let entity = if let Some(rtsim_entity) = npc.rtsim_entity {
         entity.with(rtsim_entity).with(RepositionOnChunkLoad {
             needs_ground: false,
@@ -157,6 +157,14 @@ pub fn handle_create_npc(server: &mut Server, pos: Pos, mut npc: NpcBuilder) ->
 
     let new_entity = entity.build();
 
+    if let Some(rtsim_entity) = npc.rtsim_entity {
+        server
+            .state()
+            .ecs()
+            .write_resource::<IdMaps>()
+            .add_rtsim(rtsim_entity, new_entity);
+    }
+
     // Add to group system if a pet
     if let comp::Alignment::Owned(owner_uid) = npc.alignment {
         let state = server.state();