diff --git a/lib/libnx/include/nx/nca.h b/lib/libnx/include/nx/nca.h
index 04f9036..2754b74 100644
--- a/lib/libnx/include/nx/nca.h
+++ b/lib/libnx/include/nx/nca.h
@@ -88,7 +88,7 @@ namespace nx
 		char signature[4];
 		byte_t distribution_type;
 		byte_t content_type;
-		byte_t key_generation; // KeyGeneration
+		byte_t key_generation;
 		byte_t key_area_encryption_key_index;
 		le_uint64_t content_size;
 		le_uint64_t program_id;
@@ -108,6 +108,14 @@ namespace nx
 		crypto::aes::sAes128Key enc_aes_key[nca::kAesKeyNum];
 	};
 
+	struct sNcaHeaderBlock
+	{
+		byte_t signature_main[crypto::rsa::kRsa2048Size];
+		byte_t signature_acid[crypto::rsa::kRsa2048Size];
+		sNcaHeader header;
+		byte_t fs_header[nx::nca::kPartitionNum][nx::nca::kSectorSize];
+	};
+
 	struct sNcaFsHeader
 	{
 		le_uint16_t version; // usually 0x0002