diff --git a/src/asm_acquire.ml b/src/asm_acquire.ml
index a574aa2..1ddb3ce 100644
--- a/src/asm_acquire.ml
+++ b/src/asm_acquire.ml
@@ -3,26 +3,10 @@
     Uses `objdump -d` internally, and parses the output
 *)
 
-(** A memory address *)
-type addr_t = int
-
-(** A single asm instruction *)
-type asm_instr_t = {
-  instr_addr:   addr_t;   (** Memory location of this instruction *)
-  instr_bytes:  Bytes.t;  (** Binary representation of the instruction *)
-  instr_asm:    string;   (** Asm for the instruction (eg `movq …`) *)
-}
-type asm_t = asm_instr_t list
-type asm_sub_t = {
-  sub_section:  string;
-  sub_name:     string;
-  sub_addr:     addr_t;
-  sub_asm:      asm_t;
-}
-type asm_info_t = asm_sub_t list
-
 exception ParseError of string
 
+module AsmTypes = Asm_info.NoAnnot
+
 (** Pretty printers *)
 let pp_hex_bytes ppx bytes_array =
   (* Number of lone spaces to be printed after the bytes. Objdump prints 21. *)
@@ -32,19 +16,23 @@ let pp_hex_bytes ppx bytes_array =
   Format.fprintf ppx "%s" (String.make remaining_spaces ' ')
 
 let pp_asm_instr ppx asm_instr =
-  Format.fprintf ppx "    %04x:\t%a\t%s@."
-    asm_instr.instr_addr
-    pp_hex_bytes asm_instr.instr_bytes
-    asm_instr.instr_asm
+  AsmTypes.(
+    Format.fprintf ppx "    %04x:\t%a\t%s@."
+      asm_instr.instr_addr
+      pp_hex_bytes asm_instr.instr_bytes
+      asm_instr.instr_asm
+  )
 
 let pp_asm ppx asm_instrs = List.iter (pp_asm_instr ppx) asm_instrs
 
 let pp_asm_sub ppx asm_sub =
-  Format.fprintf ppx "%016x <%s> {%s}:@.@[%a@]@."
-    asm_sub.sub_addr
-    asm_sub.sub_name
-    asm_sub.sub_section
-    pp_asm asm_sub.sub_asm
+  AsmTypes.(
+    Format.fprintf ppx "%016x <%s> {%s}:@.@[%a@]@."
+      asm_sub.sub_addr
+      asm_sub.sub_name
+      asm_sub.sub_section
+      pp_asm asm_sub.sub_asm
+  )
 
 let pp_asm_info ppx asm_info =
   List.iter (fun asm_sub -> Format.fprintf ppx "%a" pp_asm_sub asm_sub)
@@ -131,12 +119,14 @@ let get_objdump prog_path =
       None if the previous subroutine was committed;
     - the current subroutine's asm lines
 *)
+
 type interpret_objdump_accu =
-    ObjdumpAccu of asm_info_t * string * asm_sub_t option * asm_t
+    ObjdumpAccu of AsmTypes.asm_info_t * string * AsmTypes.asm_sub_t option *
+                   AsmTypes.asm_t
 
 (** Interprets `objdump -d` output and yield a list of functions, alongside
     with their addresses, symbol names, asm, … *)
-let interpret_objdump objdump_out : asm_info_t =
+let interpret_objdump objdump_out : AsmTypes.asm_info_t =
 
   (* Reads a string of bytes formatted like "01 23 ae 3f" and output a Bytes.t
      object *)
@@ -201,11 +191,12 @@ let interpret_objdump objdump_out : asm_info_t =
                        (Format.sprintf "Invalid subroutine line: \"%s\""
                           cur_line))
                ) in
-             let line = {
+             let line = AsmTypes.({
                instr_addr = addr;
                instr_bytes = bytes_repr;
-               instr_asm = asm_repr
-             } in
+               instr_asm = asm_repr;
+               instr_annot = ();
+             }) in
              (match objdump_accu with
               | ObjdumpAccu(cur_info, cur_section, Some in_flight, asm) ->
                 ObjdumpAccu(cur_info, cur_section, Some in_flight, line::asm)
diff --git a/src/asm_info.ml b/src/asm_info.ml
new file mode 100644
index 0000000..4ceb7d0
--- /dev/null
+++ b/src/asm_info.ml
@@ -0,0 +1,26 @@
+module type Annot_type = sig
+  type instr_annot_t
+end
+
+module S (Annot: Annot_type) = struct
+  (** A memory address *)
+  type addr_t = int
+
+  (** A single asm instruction *)
+  type asm_instr_t = {
+    instr_addr:   addr_t;   (** Memory location of this instruction *)
+    instr_bytes:  Bytes.t;  (** Binary representation of the instruction *)
+    instr_asm:    string;   (** Asm for the instruction (eg `movq …`) *)
+    instr_annot:  Annot.instr_annot_t;  (** User-defined annotation *)
+  }
+  type asm_t = asm_instr_t list
+  type asm_sub_t = {
+    sub_section:  string;
+    sub_name:     string;
+    sub_addr:     addr_t;
+    sub_asm:      asm_t;
+  }
+  type asm_info_t = asm_sub_t list
+end
+
+module NoAnnot = S(struct type instr_annot_t = unit end)
diff --git a/src/test_objdump.ml b/src/test_objdump.ml
index eb6bd25..8652c40 100644
--- a/src/test_objdump.ml
+++ b/src/test_objdump.ml
@@ -13,8 +13,11 @@ let read_all handle =
   let len = in_channel_length handle in
   let buffer = Bytes.create len in
   let bytes_read = input handle buffer 0 len in
-  if bytes_read <> len then
+  if bytes_read <> len then (
+    Format.eprintf "Could not read whole file. Read %d, expected %d.@."
+      bytes_read len ;
     raise (Failure "Could not read whole file")
+  )
   else
     Bytes.to_string buffer
 
@@ -26,9 +29,8 @@ let _ =
   let objdump_out = read_all in_handle in
   close_in in_handle ;
   let parsed = Asm_acquire.interpret_objdump objdump_out in
-  Format.eprintf "%a" Asm_acquire.pp_asm_info parsed
-  (*
-  List.iter (fun asm_sub ->
-      Format.eprintf "%a" Asm_acquire.pp_asm_sub asm_sub)
-    parsed
-     *)
+
+  let render_data = Renderer.init_render_data parsed in
+  let render_data, box1 = Renderer.add_box render_data (0x1004, 0x100f) in
+  ignore box1 ;
+  Format.printf "%s@." (Renderer.to_string Html_renderer.render render_data)