diff --git a/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala b/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala
index 0679bfd0f3ffe47c6512ec0de8d4992ac59f9321..820c9965d09b3ce78f7fa41a62ac3088e0413414 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala
@@ -136,6 +136,10 @@ class CrossValidator(override val uid: String) extends Estimator[CrossValidatorM
 /**
  * :: Experimental ::
  * Model from k-fold cross validation.
+ *
+ * @param bestModel The best model selected from k-fold cross validation.
+ * @param avgMetrics Average cross-validation metrics for each paramMap in [[estimatorParamMaps]], in the
+ *                   corresponding order.
  */
 @Experimental
 class CrossValidatorModel private[ml] (