diff --git a/strafe-client/src/model_physics.rs b/strafe-client/src/model_physics.rs
index 1d3f307..bb50252 100644
--- a/strafe-client/src/model_physics.rs
+++ b/strafe-client/src/model_physics.rs
@@ -704,6 +704,20 @@ impl MinkowskiMesh<'_>{
 			},
 		}
 	}
+	// TODO: fundamentally improve this algorithm.
+	// All it needs to do is find the closest point on the mesh
+	// and return the FEV which the point resides on.
+	//
+	// What it actually does is use the above functions to trace a ray in from infinity,
+	// crawling the closest point along the mesh surface until the ray reaches
+	// the starting point to discover the final FEV.
+	//
+	// The actual collision prediction probably does a single test
+	// and then immediately returns with 0 FEV transitions on average,
+	// because of the strict time_limit constraint.
+	//
+	// Most of the calculation time is just calculating the starting point
+	// for the "actual" crawling algorithm below (predict_collision_{in|out}).
 	fn closest_fev_not_inside(&self,mut infinity_body:Body)->Option<FEV<MinkowskiMesh>>{
 		infinity_body.infinity_dir().map_or(None,|dir|{
 			let infinity_fev=self.infinity_fev(-dir,infinity_body.position);