diff --git a/HackerNet.Domain/Comment.cs b/HackerNet.Domain/Comment.cs
new file mode 100644
index 0000000..418a6f6
--- /dev/null
+++ b/HackerNet.Domain/Comment.cs
@@ -0,0 +1,17 @@
+namespace HackerNet.Domain;
+
+public class Comment
+{
+  public Guid Id { get; }
+  public Guid LinkId { get; }
+  public string Content { get; }
+  public DateTime CreatedAt { get; }
+
+  public Comment(Guid linkId, string content)
+  {
+    Id = Guid.NewGuid();
+    LinkId = linkId;
+    Content = content;
+    CreatedAt = DateTime.UtcNow;
+  }
+}
\ No newline at end of file
diff --git a/HackerNet.Domain/ICommentRepository.cs b/HackerNet.Domain/ICommentRepository.cs
new file mode 100644
index 0000000..b6f3e0f
--- /dev/null
+++ b/HackerNet.Domain/ICommentRepository.cs
@@ -0,0 +1,6 @@
+namespace HackerNet.Domain;
+
+public interface ICommentRepository
+{
+  void Add(Comment comment);
+}
\ No newline at end of file