diff --git a/docs/ingestion/native-batch-input-source.md b/docs/ingestion/native-batch-input-source.md
index e2c7bd038b1..624f8fab194 100644
--- a/docs/ingestion/native-batch-input-source.md
+++ b/docs/ingestion/native-batch-input-source.md
@@ -756,6 +756,8 @@ Use the Combining input source only if all the delegates are splittable and can
 
 Similar to other input sources, the Combining input source supports a single `inputFormat`.
 Delegate input sources that require an `inputFormat` must have the same format for input data.
+If you include the [Druid input source](#druid-input-source), the timestamp column is stored in the `__time` field.
+To correctly combine the data from the Druid input source with another source, ensure that other delegate input sources also store the timestamp column in `__time`.
 
 |Property|Description|Required|
 |--------|-----------|---------|
@@ -797,4 +799,4 @@ Set this value in `maxNumConcurrentSubTasks` in `tuningConfig` based on the seco
 - `range` or `single_dim` partitioning: greater than or equal to 1
 - `hashed` or `dynamic` partitioning: greater than or equal to 2
 
-For more information on the `maxNumConcurrentSubTasks` field, see [Implementation considerations](native-batch.md#implementation-considerations).
\ No newline at end of file
+For more information on the `maxNumConcurrentSubTasks` field, see [Implementation considerations](native-batch.md#implementation-considerations).