diff --git a/src/objective-c/ProtoRPC/ProtoRPC.h b/src/objective-c/ProtoRPC/ProtoRPC.h
index 7f0e68fbea0..f6dfbb14440 100644
--- a/src/objective-c/ProtoRPC/ProtoRPC.h
+++ b/src/objective-c/ProtoRPC/ProtoRPC.h
@@ -73,6 +73,9 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * A convenience class of objects that act as response handlers of calls. Issues
  * response to a single handler when the response is completed.
+ *
+ * The object is stateful and should not be reused for multiple calls. If multiple calls share the
+ * same response handling logic, create separate GRPCUnaryResponseHandler objects for each call.
  */
 @interface GRPCUnaryResponseHandler<ResponseType> : NSObject<GRPCProtoResponseHandler>