diff --git a/src/storage/storage.zig b/src/storage/storage.zig
index d458f18..9ea6d2a 100644
--- a/src/storage/storage.zig
+++ b/src/storage/storage.zig
@@ -41,13 +41,16 @@ pub const Storage = struct {
     }
 };
 
+// A Storage transaction
 pub const Transaction = struct {
     txn: lmdb.Transaction,
 
+    // Abandon the Transaction without applying any change
     pub fn abort(self: Transaction) void {
         self.txn.abort();
     }
 
+    // Serialize and store a block in database
     pub fn store_block(allocator: std.mem.Allocator, txn: Transaction, block: *Block) !void {
         const blocks = try txn.txn.database("blocks", .{ .create = true });
         try blocks.set(&block.hash, try block.serizalize(allocator));
diff --git a/src/types/block.zig b/src/types/block.zig
index ba8389d..c622c9e 100644
--- a/src/types/block.zig
+++ b/src/types/block.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 
+// A bitcoin block with additonal usefull data
 pub const Block = struct {
     hash: [32]u8,
     height: i32,