diff --git a/CMakeLists.txt b/CMakeLists.txt
index e7a45cb..5300119 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,14 +24,16 @@ add_executable(biner)
 target_sources(biner
   PRIVATE
     main.c
+    transpile.h
     transpile_c.c
+    tree.h
     tree.c
+    zone.h
     ${BISON_biner-parser_OUTPUTS}
     ${FLEX_biner-scanner_OUTPUTS}
   PUBLIC
     c/pack.h
     c/unpack.h
-    c/zone.h
 )
 target_include_directories(biner PRIVATE . ${CMAKE_CURRENT_BINARY_DIR})
 
diff --git a/TODO.TXT b/TODO.TXT
new file mode 100644
index 0000000..ed861b3
--- /dev/null
+++ b/TODO.TXT
@@ -0,0 +1,4 @@
+  resolve all TODO in source codes
+  remove f16/f32/f64 types
+  partial code generation for C (divide decls and functions)
+  release v1.0.1
diff --git a/biner.l b/biner.l
index 90b5d45..bd7cea9 100644
--- a/biner.l
+++ b/biner.l
@@ -6,7 +6,7 @@
 #include <inttypes.h>
 
 #include "./tree.h"
-#include "./c/zone.h"
+#include "./zone.h"
 
 #include "generated/biner.y.h"
 
diff --git a/biner.y b/biner.y
index f91e12d..4be1f55 100644
--- a/biner.y
+++ b/biner.y
@@ -8,7 +8,7 @@
 #include <string.h>
 
 #include "./tree.h"
-#include "./c/zone.h"
+#include "./zone.h"
 
 #define ctx (biner_tree_parse_context_)
 
diff --git a/tree.c b/tree.c
index 5a6e8b6..67ebc57 100644
--- a/tree.c
+++ b/tree.c
@@ -8,7 +8,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "./c/zone.h"
+#include "./zone.h"
 
 #include "generated/biner.y.h"
 
diff --git a/tree.h b/tree.h
index fef0c6a..3714cc0 100644
--- a/tree.h
+++ b/tree.h
@@ -8,7 +8,7 @@
 #include <stdio.h>
 #include <string.h>
 
-#include "./c/zone.h"
+#include "./zone.h"
 
 typedef struct biner_tree_expr_t                    biner_tree_expr_t;
 typedef struct biner_tree_struct_member_t           biner_tree_struct_member_t;
diff --git a/c/zone.h b/zone.h
similarity index 100%
rename from c/zone.h
rename to zone.h