diff --git a/src/AcDream.Core.Net/Messages/UpdatePosition.cs b/src/AcDream.Core.Net/Messages/UpdatePosition.cs
index cccfe4c..e4978cf 100644
--- a/src/AcDream.Core.Net/Messages/UpdatePosition.cs
+++ b/src/AcDream.Core.Net/Messages/UpdatePosition.cs
@@ -64,6 +64,7 @@ public static class UpdatePosition
         CreateObject.ServerPosition Position,
         System.Numerics.Vector3? Velocity,
         uint? PlacementId,
+        bool IsGrounded,
         ushort InstanceSequence = 0,
         ushort TeleportSequence = 0,
         ushort ForcePositionSequence = 0);
@@ -164,6 +165,7 @@ public static class UpdatePosition
                 RotationW: rw, RotationX: rx, RotationY: ry, RotationZ: rz);
 
             return new Parsed(guid, serverPos, velocity, placementId,
+                IsGrounded: (flags & PositionFlags.IsGrounded) != 0,
                 instSeq, teleSeq, forceSeq);
         }
         catch
diff --git a/src/AcDream.Core.Net/WorldSession.cs b/src/AcDream.Core.Net/WorldSession.cs
index 47ef10b..3e76509 100644
--- a/src/AcDream.Core.Net/WorldSession.cs
+++ b/src/AcDream.Core.Net/WorldSession.cs
@@ -110,7 +110,8 @@ public sealed class WorldSession : IDisposable
     public readonly record struct EntityPositionUpdate(
         uint Guid,
         CreateObject.ServerPosition Position,
-        System.Numerics.Vector3? Velocity);
+        System.Numerics.Vector3? Velocity,
+        bool IsGrounded);
 
     /// <summary>
     /// Fires when the session parses a 0xF748 UpdatePosition game message.
@@ -711,7 +712,8 @@ public sealed class WorldSession : IDisposable
                     PositionUpdated?.Invoke(new EntityPositionUpdate(
                         posUpdate.Value.Guid,
                         posUpdate.Value.Position,
-                        posUpdate.Value.Velocity));
+                        posUpdate.Value.Velocity,
+                        posUpdate.Value.IsGrounded));
                 }
             }
             else if (op == VectorUpdate.Opcode)