diff --git a/flap/src/x86-64/retrolixToX86_64.ml b/flap/src/x86-64/retrolixToX86_64.ml
index 48a92cb..4b30924 100644
--- a/flap/src/x86-64/retrolixToX86_64.ml
+++ b/flap/src/x86-64/retrolixToX86_64.ml
@@ -426,16 +426,55 @@ end
 module InstructionSelector : InstructionSelector = struct
   open T
 
-  let mov ~(dst : dst) ~(src : src) = failwith "Students! This is your job!"
-  let bin ins ~dst ~srcl ~srcr = failwith "Students! This is your job!"
-  let add ~dst ~srcl ~srcr = failwith "Students! This is your job!"
-  let sub ~dst ~srcl ~srcr = failwith "Students! This is your job!"
-  let mul ~dst ~srcl ~srcr = failwith "Students! This is your job!"
-  let div ~dst ~srcl ~srcr = failwith "Students! This is your job!"
-  let andl ~dst ~srcl ~srcr = failwith "Students! This is your job!"
-  let orl ~dst ~srcl ~srcr = failwith "Students! This is your job!"
-  let conditional_jump ~cc ~srcl ~srcr ~ll ~lr = failwith "Students! This is your job!"
-  let switch ?default ~discriminant ~cases () = failwith "Students! This is your job!"
+  let mov ~(dst : dst) ~(src : src) =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let bin ins ~dst ~srcl ~srcr =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let add ~dst ~srcl ~srcr =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let sub ~dst ~srcl ~srcr =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let mul ~dst ~srcl ~srcr =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let div ~dst ~srcl ~srcr =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let andl ~dst ~srcl ~srcr =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let orl ~dst ~srcl ~srcr =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let conditional_jump ~cc ~srcl ~srcr ~ll ~lr =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
+
+  let switch ?default ~discriminant ~cases () =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
 end
 
 module FrameManager (IS : InstructionSelector) : FrameManager = struct
@@ -461,23 +500,29 @@ module FrameManager (IS : InstructionSelector) : FrameManager = struct
   ;;
 
   let frame_descriptor ~params ~locals =
-    (* Student! Implement me! *)
+    (* TODO: Student! Implement me! *)
     { param_count = 0; locals_space = 0; stack_map = S.IdMap.empty }
   ;;
 
-  let location_of fd id = failwith "Students! This is your job!"
+  let location_of fd id =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
 
   let function_prologue fd =
-    (* Student! Implement me! *)
+    (* TODO: Student! Implement me! *)
     []
   ;;
 
   let function_epilogue fd =
-    (* Student! Implement me! *)
+    (* TODO: Student! Implement me! *)
     []
   ;;
 
-  let call fd ~kind ~f ~args = failwith "Students! This is your job!"
+  let call fd ~kind ~f ~args =
+    (* TODO *)
+    failwith "Students! This is your job!"
+  ;;
 end
 
 module CG = Codegen (InstructionSelector) (FrameManager (InstructionSelector))