diff --git a/iccard/meson.build b/iccard/meson.build
index 1da0d1e..08c5a3f 100644
--- a/iccard/meson.build
+++ b/iccard/meson.build
@@ -9,5 +9,6 @@ iccard_lib = static_library(
     sources : [
         'felica.c',
         'felica.h',
+        'mifare.h',
     ],
 )
diff --git a/iccard/mifare.h b/iccard/mifare.h
new file mode 100644
index 0000000..10dbc34
--- /dev/null
+++ b/iccard/mifare.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+struct mifare_block {
+    uint8_t bytes[16];
+};
+
+struct mifare_sector {
+    struct mifare_block blocks[4];
+};
+
+struct mifare {
+    struct mifare_sector sectors[16];
+};