diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructField.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructField.scala
index 902cae9150ed..35f9970a0aae 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructField.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructField.scala
@@ -79,6 +79,8 @@ case class StructField(
   /**
    * Returns a string containing a schema in DDL format. For example, the following value:
    * `StructField("eventId", IntegerType)` will be converted to `eventId` INT.
+   *
+   * @since 2.4.0
    */
   def toDDL: String = {
     val comment = getComment()
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala
index c5ca169c955d..06289b148320 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala
@@ -365,6 +365,8 @@ case class StructType(fields: Array[StructField]) extends DataType with Seq[Stru
    * `StructType(Seq(StructField("eventId", IntegerType), StructField("s", StringType)))`
    * will be converted to `eventId` INT, `s` STRING.
    * The returned DDL schema can be used in a table creation.
+   *
+   * @since 2.4.0
    */
   def toDDL: String = fields.map(_.toDDL).mkString(",")
 
@@ -441,6 +443,8 @@ object StructType extends AbstractDataType {
   /**
    * Creates StructType for a given DDL-formatted string, which is a comma separated list of field
    * definitions, e.g., a INT, b STRING.
+   *
+   * @since 2.2.0
    */
   def fromDDL(ddl: String): StructType = CatalystSqlParser.parseTableSchema(ddl)