diff --git a/Alpaca.Markets/Enums/AccountActivityType.cs b/Alpaca.Markets/Enums/AccountActivityType.cs
index 94bf08bb..1cc97ec2 100644
--- a/Alpaca.Markets/Enums/AccountActivityType.cs
+++ b/Alpaca.Markets/Enums/AccountActivityType.cs
@@ -244,6 +244,13 @@ public enum AccountActivityType
     [EnumMember(Value = "OPXRC")]
     OptionExercise,
 
+    /// <summary>
+    /// Option trade
+    /// </summary>
+    [UsedImplicitly]
+    [EnumMember(Value = "OPTRD")]
+    OptionTrade,
+
     /// <summary>
     /// Fee denominated in USD
     /// </summary>