diff --git a/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala b/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
index 53f44888ebaff..9a1e96bec998d 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
@@ -521,7 +521,7 @@ class DataFrameReader private[sql](sparkSession: SparkSession) extends Logging {
    *
    * You can set the following CSV-specific options to deal with CSV files:
    * <ul>
-   * <li>`sep` (default `,`): sets a single character as a separator for each
+   * <li>`sep` or  `delimiter` (default `,`): sets a single character as a separator for each
    * field and value.</li>
    * <li>`encoding` (default `UTF-8`): decodes the CSV files by the given encoding
    * type.</li>