diff --git a/Lib9c/Action/Synthesize.cs b/Lib9c/Action/Synthesize.cs
index bf743a0647..818a70d8a2 100644
--- a/Lib9c/Action/Synthesize.cs
+++ b/Lib9c/Action/Synthesize.cs
@@ -16,6 +16,10 @@
namespace Nekoyume.Action
{
+ ///
+ /// Synthesize action is a type of action that synthesizes items.
+ /// TODO: Implement Synthesize action.
+ ///
[Serializable]
[ActionType(TypeIdentifier)]
public class Synthesize : GameAction
@@ -48,6 +52,11 @@ public class Synthesize : GameAction
#endregion Fields
// TODO: 세부 기획 정해지면 그에 맞게 테스트 코드 우선 작성
+ ///
+ /// Execute Synthesize action, Input and .
+ /// Depending on the probability, you can get different items.
+ /// Success: Return new AvatarState with synthesized item in inventory.
+ ///
public override IWorld Execute(IActionContext context)
{
context.UseGas(1);