diff --git a/dotnet/src/Agents/Core/History/ChatHistorySummarizationReducer.cs b/dotnet/src/Agents/Core/History/ChatHistorySummarizationReducer.cs
index 8c2f022830d1..67720ab45112 100644
--- a/dotnet/src/Agents/Core/History/ChatHistorySummarizationReducer.cs
+++ b/dotnet/src/Agents/Core/History/ChatHistorySummarizationReducer.cs
@@ -29,7 +29,7 @@ public class ChatHistorySummarizationReducer : IChatHistoryReducer
     /// </summary>
     public const string DefaultSummarizationPrompt =
         """
-        Provide a concise and complete summarizion of the entire dialog that does not exceed 5 sentences
+        Provide a concise and complete summarization of the entire dialog that does not exceed 5 sentences
 
         This summary must always:
         - Consider both user and assistant interactions