diff --git a/Makefile b/Makefile
index 3fc8993..d39ed03 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ else
   MOLD = mold -run
 endif
 ROOT_IFACE = build/RMicroFileReader.o
-ROOT_IFACE_DBG = $(ROOT_IFACE)
+ROOT_IFACE_DBG = $(ROOT_IFACE).dbg
 
 .PHONY: all clean
 all: build/imgui.o $(ROOT_IFACE) ubsan
@@ -36,6 +36,9 @@ build/imgui.o: src/imgui_inc.cpp
 $(ROOT_IFACE): src/root/RMicroFileReader.cxx
 	$(CXX) -O3 -fPIC -c $(ROOTFLAGS) $< -o $@
 
+$(ROOT_IFACE_DBG): src/root/RMicroFileReader.cxx
+	$(CXX) -O0 -DDEBUG -g -fPIC -c $(ROOTFLAGS) $< -o $@
+
 # debug build
 d: $(ROOT_IFACE_DBG) build/imgui.o
 	$(MOLD) $(CXX) -DDEBUG -g -O0 -DENABLE_ASAN $(CFLAGS) $(INC) $(ROOTFLAGS) -o rntviewer src/rntviewer.cpp build/imgui.o -lasan $(ROOT_IFACE_DBG) $(LIBS) $(ROOTLIBS)
diff --git a/src/render.cpp b/src/render.cpp
index e063302..64799e8 100644
--- a/src/render.cpp
+++ b/src/render.cpp
@@ -84,6 +84,8 @@ u32 mem_edit_bg_color_fn(const u8 *, u64 off, void *user_data)
   if (rdata.rng_footer.start <= off && off < rdata.rng_footer.end() - 8)        return COL(app->viewer.col_footer);
   if (rdata.rng_footer.end() - 8 <= off && off < rdata.rng_footer.end())        return COL(app->viewer.col_checksum);
 
+  if (rdata.rng_tkeys_list.start <= off && off < rdata.rng_tkeys_list.end())    return COL(app->viewer.col_tkeys_list);
+
   // @Speed
   for (u64 cg_idx = 0; cg_idx < rdata.n_cluster_groups; ++cg_idx) {
     Cluster_Group_Info &cg_info = rdata.cluster_groups[cg_idx];
@@ -155,6 +157,7 @@ void make_viewer(App_State &app)
   COL(col_page_start, 200, 0, 200);
   COL(col_checksum, 134, 65, 25);
   COL(col_page_list, 60, 110, 120);
+  COL(col_tkeys_list, 100, 140, 100);
   COL(col_highlight, 190, 190, 190);
 #undef COL
 
@@ -352,6 +355,11 @@ void update_and_render(Arena *arena, App_State &app, f32 delta_time_ms)
       ImGui::SameLine(); 
       ImGui::Text("%s", to_pretty_size(scratch.arena, app.rndata.tot_page_list_size).c());
 
+      ImGui::ColorEdit3("_TKey List", app.viewer.col_tkeys_list, flags);
+      ImGui::SameLine(); 
+      if (ImGui::Button("TKey List"))      viewer_jump_to(app.viewer, app.rndata.rng_tkeys_list.start);
+
+      // -------------------------------
       ImGui::Separator();
       String8 root_version_str = push_str8f(scratch.arena, "%u.%u.%u", 
                                             app.tfile_data.root_version_major,
diff --git a/src/render.h b/src/render.h
index 99a9eb7..2cac229 100644
--- a/src/render.h
+++ b/src/render.h
@@ -13,6 +13,7 @@ struct Viewer {
   f32 col_page_start[3];
   f32 col_checksum[3];
   f32 col_page_list[3];
+  f32 col_tkeys_list[3];
   f32 col_highlight[3];
 
   u64 base_display_addr;
diff --git a/src/rntuple.cpp b/src/rntuple.cpp
index 143921d..c2220ad 100644
--- a/src/rntuple.cpp
+++ b/src/rntuple.cpp
@@ -263,7 +263,7 @@ TFile_Data get_tfile_data(const Inspected_File &file)
   memcpy(&info_nbytes_be, file.mem + root_file_info.info_nbytes_seek, sizeof(info_nbytes_be));
   tfile_data.rng_root_file_info.len = bswap_32(info_nbytes_be);
 
-  // parse free
+  // parse free list
   if (is_big_file) {
     u64 free_seek_be;
     memcpy(&free_seek_be, file.mem + root_file_info.free_seek_seek, sizeof(free_seek_be));
@@ -302,6 +302,8 @@ RNTuple_Data get_rntuple_data(Arena *arena, const Inspected_File &file, String8
     rndata.rng_anchor_key.start = file_info.anchor_key_seek;
     rndata.rng_anchor_key.len = file_info.anchor_key_nbytes;
     rndata.rblob_header_size = file_info.rblob_key_header_nbytes;
+    rndata.rng_tkeys_list.start = file_info.tkeys_list_seek;
+    rndata.rng_tkeys_list.len = file_info.tkeys_list_nbytes;
 
     gather_ntuple_metadata(arena, file_reader, file_info, rndata);
   }
diff --git a/src/rntuple.h b/src/rntuple.h
index 40fa6cd..0f155fb 100644
--- a/src/rntuple.h
+++ b/src/rntuple.h
@@ -61,6 +61,7 @@ struct RNTuple_Data {
   Byte_Range rng_anchor_key;
   Byte_Range rng_header;
   Byte_Range rng_footer;
+  Byte_Range rng_tkeys_list;
 
   Page_Info_Node *pages;
   u64 n_pages;
diff --git a/src/root/RMicroFileReader.cxx b/src/root/RMicroFileReader.cxx
index 4873e44..829877d 100644
--- a/src/root/RMicroFileReader.cxx
+++ b/src/root/RMicroFileReader.cxx
@@ -1151,6 +1151,10 @@ RMicroFileReader::GetNTupleProper(const char *ntupleName)
    offset = file.GetSeekKeys();
    ReadBuffer(&key, sizeof(key), offset);
    offset += key.fKeyLen;
+   // @-------- begin
+   fileInfo.tkeys_list_seek = file.GetSeekKeys();
+   fileInfo.tkeys_list_nbytes = key.fKeyLen + sizeof(nKeys);
+   // @-------- end
    ReadBuffer(&nKeys, sizeof(nKeys), offset);
    offset += sizeof(nKeys);
    bool found = false;
@@ -1161,6 +1165,7 @@ RMicroFileReader::GetNTupleProper(const char *ntupleName)
       offset += key.GetHeaderSize();
       ReadBuffer(&name, 1, offset);
       ReadBuffer(&name, name.GetSize(), offset);
+      fileInfo.tkeys_list_nbytes += key.fKeyLen + 1 + name.GetSize();
       if (std::string_view(name.fData, name.fLName) != kNTupleClassName) {
          offset = offsetNextKey;
          continue;
diff --git a/src/root/RMicroFileReader.hxx b/src/root/RMicroFileReader.hxx
index 9ab3a9f..9fbf134 100644
--- a/src/root/RMicroFileReader.hxx
+++ b/src/root/RMicroFileReader.hxx
@@ -38,6 +38,8 @@ struct RNTuple_File_Info {
   std::uint64_t anchor_key_seek;
   std::uint64_t anchor_key_nbytes;
   std::uint64_t rblob_key_header_nbytes;
+  std::uint64_t tkeys_list_seek;
+  std::uint64_t tkeys_list_nbytes;
 };
 
 struct Root_File_Info {