diff --git a/backends-velox/src/main/scala/org/apache/spark/sql/execution/unsafe/UnsafeBytesBufferArray.scala b/backends-velox/src/main/scala/org/apache/spark/sql/execution/unsafe/UnsafeBytesBufferArray.scala
index 5e64155fdfef..fb427cbaf37d 100644
--- a/backends-velox/src/main/scala/org/apache/spark/sql/execution/unsafe/UnsafeBytesBufferArray.scala
+++ b/backends-velox/src/main/scala/org/apache/spark/sql/execution/unsafe/UnsafeBytesBufferArray.scala
@@ -25,7 +25,7 @@ import java.security.MessageDigest
 
 /**
  * Used to store broadcast variable off-heap memory for broadcast variable. The underlying data
- * structure is a
+ * structure is a LongArray allocated in offheap memory.
  *
  * @param arraySize
  *   underlying array[array[byte]]'s length