diff --git a/examples/api_request_parallel_processor.py b/examples/api_request_parallel_processor.py
index a505394a..7a156154 100644
--- a/examples/api_request_parallel_processor.py
+++ b/examples/api_request_parallel_processor.py
@@ -31,8 +31,8 @@ python examples/api_request_parallel_processor.py \
 Inputs:
 - requests_filepath : str
     - path to the file containing the requests to be processed
-    - file should be a jsonl file, where each line is a json object with API parameters
-    - e.g., {"model": "text-embedding-ada-002", "input": "embed me"}
+    - file should be a jsonl file, where each line is a json object with API parameters and an optional metadata field
+    - e.g., {"model": "text-embedding-ada-002", "input": "embed me", "metadata": {"row_id": 1}}
     - as with all jsonl files, take care that newlines in the content are properly escaped (json.dumps does this automatically)
     - an example file is provided at examples/data/example_requests_to_parallel_process.jsonl
     - the code to generate the example file is appended to the bottom of this script
@@ -164,6 +164,7 @@ async def process_api_requests_from_file(
                             request_json=request_json,
                             token_consumption=num_tokens_consumed_from_request(request_json, api_endpoint, token_encoding_name),
                             attempts_left=max_attempts,
+                            metadata=request_json.pop("metadata", None)
                         )
                         status_tracker.num_tasks_started += 1
                         status_tracker.num_tasks_in_progress += 1
@@ -258,6 +259,7 @@ class APIRequest:
     request_json: dict
     token_consumption: int
     attempts_left: int
+    metadata: dict
     result: list = field(default_factory=list)
 
     async def call_api(
@@ -298,11 +300,21 @@ class APIRequest:
                 retry_queue.put_nowait(self)
             else:
                 logging.error(f"Request {self.request_json} failed after all attempts. Saving errors: {self.result}")
-                append_to_jsonl([self.request_json, [str(e) for e in self.result]], save_filepath)
+                data = (
+                    [self.request_json, [str(e) for e in self.result], self.metadata]
+                    if self.metadata
+                    else [self.request_json, [str(e) for e in self.result]]
+                )
+                append_to_jsonl(data, save_filepath)
                 status_tracker.num_tasks_in_progress -= 1
                 status_tracker.num_tasks_failed += 1
         else:
-            append_to_jsonl([self.request_json, response], save_filepath)
+            data = (
+                [self.request_json, response, self.metadata]
+                if self.metadata
+                else [self.request_json, response]
+            )
+            append_to_jsonl(data, save_filepath)
             status_tracker.num_tasks_in_progress -= 1
             status_tracker.num_tasks_succeeded += 1
             logging.debug(f"Request {self.task_id} saved to {save_filepath}")
diff --git a/examples/data/example_requests_to_parallel_process.jsonl b/examples/data/example_requests_to_parallel_process.jsonl
index 43da2c57..29adf93a 100644
--- a/examples/data/example_requests_to_parallel_process.jsonl
+++ b/examples/data/example_requests_to_parallel_process.jsonl
@@ -1,4 +1,4 @@
-{"model": "text-embedding-ada-002", "input": "0\n"}
+{"model": "text-embedding-ada-002", "input": "0\n", "metadata": {"row_id": 1}}
 {"model": "text-embedding-ada-002", "input": "1\n"}
 {"model": "text-embedding-ada-002", "input": "2\n"}
 {"model": "text-embedding-ada-002", "input": "3\n"}