diff --git a/include/examples/KeepAlivePacket.h b/include/examples/KeepAlivePacket.h
index 02b63e2..fe6c266 100644
--- a/include/examples/KeepAlivePacket.h
+++ b/include/examples/KeepAlivePacket.h
@@ -10,11 +10,7 @@ enum KeepAlivePacketFields {
 };
 
 using KeepAliveFields = std::tuple<
-	std::uint64_t,			 				//<- KeepAliveId
-	sp::BitField<std::uint16_t, 
-		sp::Field<std::uint16_t, 12>,  		//<- m_Tower
-		sp::Field<std::uint8_t, 4>			//<- m_Upgrade
-		>
+	std::uint64_t			 				//<- KeepAliveId
 	>;
 
 DeclarePacket(KeepAlive){
@@ -24,12 +20,4 @@ DeclarePacket(KeepAlive){
 	std::uint64_t GetKeepAliveId() const {
 		return GetField<KeepAlive>();
 	}
-
-	std::uint16_t GetTowerId() const {
-		return GetField<TestAlignField>().GetField<0>();
-	}
-
-	std::uint8_t GetTowerUpgrade() const {
-		return GetField<TestAlignField>().GetField<1>();
-	}
 };
\ No newline at end of file
diff --git a/include/examples/PacketExample.h b/include/examples/PacketExample.h
index 02e18fc..c185c8f 100644
--- a/include/examples/PacketExample.h
+++ b/include/examples/PacketExample.h
@@ -3,13 +3,15 @@
 enum PacketId {
 	KeepAlive = 0,
 	Disconnect,
+	UpgradeTower,
 };
 
 #include <examples/KeepAlivePacket.h>
 #include <examples/DisconnectPacket.h>
+#include <examples/UpgradeTowerPacket.h>
 
-// they must be in the same order !
-using AllPackets = std::tuple<KeepAlivePacket, DisconnectPacket>;
+// they must be in the same order as in the enum !
+using AllPackets = std::tuple<KeepAlivePacket, DisconnectPacket, UpgradeTowerPacket>;
 
 #include <sp/default/DefaultPacketHandler.h>
 #include <sp/default/DefaultPacketFactory.h>
\ No newline at end of file
diff --git a/include/examples/UpgradeTowerPacket.h b/include/examples/UpgradeTowerPacket.h
new file mode 100644
index 0000000..d54e692
--- /dev/null
+++ b/include/examples/UpgradeTowerPacket.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <sp/default/DefaultPacket.h>
+#include <sp/protocol/Field.h>
+#include <sp/protocol/MessageBase.h>
+
+enum UpgradeTowerPacketFields {
+	m_Tower = 0,
+	m_Upgrade,
+};
+
+using UpgradeTowerFields = std::tuple<
+	sp::BitField<std::uint16_t, 
+		sp::Field<std::uint16_t, 12>,  		//<- m_Tower
+		sp::Field<std::uint8_t, 4>			//<- m_Upgrade
+		>
+	>;
+
+DeclarePacket(UpgradeTower){
+  public: 
+	PacketConstructor(UpgradeTower)
+
+	std::uint16_t GetTowerId() const {
+		return GetField<0>().GetField<m_Tower>();
+	}
+
+	std::uint8_t GetTowerUpgrade() const {
+		return GetField<0>().GetField<m_Upgrade>();
+	}
+};
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index d6d7347..47f8ae5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -11,12 +11,17 @@ class KeepAliveHandler : public sp::PacketHandler {
 	void Handle(DisconnectPacket& packet) {
 		std::cout << "Disconnect handled !\n";
 	}
+
+	// TODO: add constness
+	void Handle(UpgradeTowerPacket& packet) {
+		std::cout << "UpgradeTower handled !\n";
+	}
 };
 
 int main() {
-	auto keepAlive = std::make_unique<KeepAlivePacket>(69, std::make_tuple(666, 9));
+	auto upgradeTower = std::make_unique<UpgradeTowerPacket>(std::make_tuple(666, 9));
 
-	sp::PacketMessage* msg = keepAlive.get();
+	sp::PacketMessage* msg = upgradeTower.get();
 
 	KeepAliveHandler handler;
 	msg->Dispatch(handler);
@@ -27,13 +32,10 @@ int main() {
 	std::uint8_t msgId;
 	buffer >> msgId;
 
-	auto keepAlive2 = std::make_unique<KeepAlivePacket>();
-	keepAlive2->Read(buffer);
+	auto upgradeTower2 = std::make_unique<UpgradeTowerPacket>();
+	upgradeTower2->Read(buffer);
 
-	std::cout << "KeepAlive2 : " << keepAlive2->GetKeepAliveId() << "\n";
-
-	keepAlive2->GetField<TestAlignField>().GetField<0>();
-	std::cout << "Test : " << (unsigned) keepAlive2->GetTowerId() << "\n";
+	std::cout << "Test : " << (unsigned) upgradeTower2->GetTowerId() << "\n";
 
 	sp::PacketFactory factory;
 	auto packet = factory.CreateMessage(msgId);