1 files changed, 3 insertions, 0 deletions
diff --git a/LibMatrix.EventTypes/EventContent.cs b/LibMatrix.EventTypes/EventContent.cs
index 1011e88..07f56e2 100644
--- a/LibMatrix.EventTypes/EventContent.cs
+++ b/LibMatrix.EventTypes/EventContent.cs
@@ -53,6 +53,9 @@ public abstract class TimelineEventContent : EventContent {
         // used for reactions
         [JsonPropertyName("key")]
         public string? Key { get; set; }
+        
+        [JsonExtensionData]
+        public Dictionary<string, object>? AdditionalData { get; set; } = [];
 
         public class EventInReplyTo {
             [JsonPropertyName("event_id")]