diff --git a/Bonk/EPA2D.cs b/Bonk/EPA2D.cs
index 931be03..e4edad5 100644
--- a/Bonk/EPA2D.cs
+++ b/Bonk/EPA2D.cs
@@ -18,6 +18,7 @@ namespace MoonTools.Core.Bonk
         CounterClockwise
     }
 
+    // TODO: convert SimplexVertices to PooledList
     public static class EPA2D
     {
         // vector returned gives direction from A to B
diff --git a/Bonk/GJK2D.cs b/Bonk/GJK2D.cs
index ea814bc..e6c06a9 100644
--- a/Bonk/GJK2D.cs
+++ b/Bonk/GJK2D.cs
@@ -5,6 +5,7 @@ using MoonTools.Core.Bonk.Extensions;
 
 namespace MoonTools.Core.Bonk
 {
+    // TODO: get rid of minkowski closure for GC purposes
     public static class GJK2D
     {
         public static bool TestCollision(IShape2D shapeA, Transform2D transformA, IShape2D shapeB, Transform2D transformB)