diff --git a/include/kernel/dri/fs/ext2/ext2.h b/include/kernel/dri/fs/ext2/ext2.h
index 1adf51c..4205c4b 100644
--- a/include/kernel/dri/fs/ext2/ext2.h
+++ b/include/kernel/dri/fs/ext2/ext2.h
@@ -78,5 +78,8 @@
 	EXT2_OS_OTHER_BSD,
 };
 
+#define EXT2_SIGNATURE 0xef53
+
 struct ext2_superblock ext2_read_superblock();
 void ext2_mount(struct fs_node *where);
+bool ext2_valid_filesystem();