diff --git a/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/recordtransformer/SpecialValueTransformer.java b/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/recordtransformer/SpecialValueTransformer.java
index 33838031942d..29596e093572 100644
--- a/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/recordtransformer/SpecialValueTransformer.java
+++ b/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/recordtransformer/SpecialValueTransformer.java
@@ -35,8 +35,9 @@
  *   <li>Negative zero (-0.0) should be converted to 0.0</li>
  *   <li>NaN should be converted to default null</li>
  * </ul>
- * <p>NOTE: should put this after the {@link DataTypeTransformer} so that all values follow the data types in
- * {@link FieldSpec}.
+ * <p>NOTE: should put this after the {@link DataTypeTransformer} so that we already have the values complying
+ * with the schema before handling special values and before {@link NullValueTransformer} so that it transforms
+ * all the null values properly.
  */
 public class SpecialValueTransformer implements RecordTransformer {