Clarify

README.md

@@ -462,14 +462,16 @@ The example scripts are available as `test_<format/feature>.js` with more code a
     Read [this comment](https://github.com/mostafa/xk6-kafka/issues/298#issuecomment-2165246467).
 
 14. I want to specify the offset of a message when consuming from a topic. How can I do that?
+    To specify the offset of a message while consuming from a topic, use the following options based on your consumption setup:
 
-    To specify the offset of a message while consuming from a topic, use the `startOffset` option in the Reader object. This option allows you to define the starting point for message consumption. Here are the values you can use for `startOffset`:
+    1. **When consuming from a group:**
+    Use the `startOffset` option in the `Reader` object. This option allows you to define the starting point for message consumption. Here are the values you can use for `startOffset`:
 
-    - `-1`: Consume from the most recent message. This is equivalent to START_OFFSETS_LAST_OFFSET.
-    - `-2`: Consume from the oldest message. This is equivalent to START_OFFSETS_FIRST_OFFSET.
-    - Any positive number: Consume from the specific offset number provided.
+       - `-1`: Consume from the most recent message. This is equivalent to `START_OFFSETS_LAST_OFFSET`.
+       - `-2`: Consume from the oldest message. This is equivalent to `START_OFFSETS_FIRST_OFFSET`.
+       - Any positive number: Consume from the specific offset number provided.
 
-    The constants `START_OFFSETS_LAST_OFFSET` and `START_OFFSETS_FIRST_OFFSET` are part of the xk6-kafka module. You can import and use them in your script for better readability and maintainability. Note that the `startOffset` option is only applicable when consuming from a group.
+    The constants `START_OFFSETS_LAST_OFFSET` and `START_OFFSETS_FIRST_OFFSET` are part of the xk6-kafka module. You can import and use them in your script. The `startOffset` option is a string.
 
     ```javascript
     import {
@@ -478,10 +480,23 @@ The example scripts are available as `test_<format/feature>.js` with more code a
     } from "k6/x/kafka";
 
     const reader = new Reader({
-        brokers: brokers,
-        groupID: groupID,
-        groupTopics: [topic],
-        startOffset: START_OFFSETS_LAST_OFFSET,
+        brokers: ["localhost:9092"], // Replace with your broker(s)
+        groupID: "example-group", // Specify your consumer group ID
+        groupTopics: ["example-topic"], // List of topics for the group
+        startOffset: START_OFFSETS_LAST_OFFSET, // Use the most recent offset
+    });
+    ```
+
+    2. **When consuming from a topic:**
+    Use the `offset` option instead of `startOffset`. The `offset` option is a number that directly specifies the offset of the message you want to consume, unlike `startOffset`, which is a string.
+
+    ```javascript
+    import { Reader } from "k6/x/kafka";
+
+    const reader = new Reader({
+        brokers: ["localhost:9092"], // Replace with your broker(s)
+        topic: "example-topic", // Specify the topic
+        offset: 10, // Consume from offset 10
     });
     ```