diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 05331066dc..1fe8048a8f 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -3282,6 +3282,10 @@ namespace OpenSim.Region.Framework.Scenes
///
/// Event called by the physics plugin to tell the avatar about a collision.
///
+ ///
+ /// This function is called continuously, even when there are no collisions which might be very inefficient.
+ /// However, we can't avoid this yet since some of this method might currently rely on being called every frame.
+ ///
///
public void PhysicsCollisionUpdate(EventArgs e)
{