diff --git a/Lagrange.Core/Message/Entity/LightAppEntity.cs b/Lagrange.Core/Message/Entity/LightAppEntity.cs
index 501338c0e..1b5d8b730 100644
--- a/Lagrange.Core/Message/Entity/LightAppEntity.cs
+++ b/Lagrange.Core/Message/Entity/LightAppEntity.cs
@@ -27,7 +27,7 @@ IEnumerable<Elem> IMessageEntity.PackElement()
     {
         using var payload = new BinaryPacket()
             .WriteByte(0x01)
-            .WriteBytes(ZCompression.ZDecompress(Encoding.UTF8.GetBytes(Payload)));
+            .WriteBytes(ZCompression.ZCompress(Encoding.UTF8.GetBytes(Payload)));
 
         return new Elem[]
         {
diff --git a/Lagrange.Core/Message/MessageBuilder.cs b/Lagrange.Core/Message/MessageBuilder.cs
index ff2aa919e..f6f698a91 100644
--- a/Lagrange.Core/Message/MessageBuilder.cs
+++ b/Lagrange.Core/Message/MessageBuilder.cs
@@ -161,6 +161,18 @@ public MessageBuilder Poke(uint type = 1)
 
         return this;
     }
+    
+    /// <summary>
+    /// Add a dedicated LightApp entity to message chain
+    /// </summary>
+    /// <param name="payload">Json Payload</param>
+    public MessageBuilder LightApp(string payload)
+    {
+        var pokeEntity = new LightAppEntity(payload);
+        _chain.Add(pokeEntity);
+
+        return this;
+    }
 
     public MessageBuilder File(byte[] file, string fileName)
     {