diff --git a/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatCompletion.cs b/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatCompletion.cs
index 2a9237d9b5a..729483e7c30 100644
--- a/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatCompletion.cs
+++ b/src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatCompletion.cs
@@ -59,7 +59,7 @@ public ChatMessage Message
     /// <summary>Gets or sets the ID of the chat completion.</summary>
     public string? CompletionId { get; set; }
 
-    /// <summary>Gets or sets the model ID using in the creation of the chat completion.</summary>
+    /// <summary>Gets or sets the model ID used in the creation of the chat completion.</summary>
     public string? ModelId { get; set; }
 
     /// <summary>Gets or sets a timestamp for the chat completion.</summary>