diff --git a/CHANGELOG.md b/CHANGELOG.md
index d59070b54..f8deca076 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 # v1.2.1
 
+- Fix typo in `PurgeInstanceAsync`  in `DurableTaskClient` (https://github.com/microsoft/durabletask-dotnet/pull/264)
 - Fix `TaskFailureDetails.IsCausedBy` to support custom exceptions and 3rd party exceptions ([#273](https://github.com/microsoft/durabletask-dotnet/pull/273))
 - Microsoft.Azure.DurableTask.Core dependency increased to `2.16.2`
 
diff --git a/src/Client/Core/DurableTaskClient.cs b/src/Client/Core/DurableTaskClient.cs
index 9fc8f89cc..cd5268309 100644
--- a/src/Client/Core/DurableTaskClient.cs
+++ b/src/Client/Core/DurableTaskClient.cs
@@ -337,7 +337,7 @@ public abstract Task ResumeInstanceAsync(
     public abstract AsyncPageable<OrchestrationMetadata> GetAllInstancesAsync(OrchestrationQuery? filter = null);
 
     /// <inheritdoc cref="PurgeInstanceAsync(string, PurgeInstanceOptions, CancellationToken)"/>
-    public virtual Task<PurgeResult> PurgeInstancesAsync(string instanceId, CancellationToken cancellation)
+    public virtual Task<PurgeResult> PurgeInstanceAsync(string instanceId, CancellationToken cancellation)
         => this.PurgeInstanceAsync(instanceId, null, cancellation);
 
     /// <summary>
diff --git a/src/Client/Core/RELEASENOTES.md b/src/Client/Core/RELEASENOTES.md
index e69de29bb..f731feb71 100644
--- a/src/Client/Core/RELEASENOTES.md
+++ b/src/Client/Core/RELEASENOTES.md
@@ -0,0 +1 @@
+- Fix typo in `PurgeInstanceAsync`  in `DurableTaskClient` (https://github.com/microsoft/durabletask-dotnet/pull/264)
\ No newline at end of file