diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala
index 2e703671fcd66693d43865f760104b17e8ba7c07..6be3cbcae6295b9390f778201f0d5e74b0b5db68 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala
@@ -85,7 +85,7 @@ case class Randn(seed: Long) extends RDG {
 
   def this(seed: Expression) = this(seed match {
     case IntegerLiteral(s) => s
-    case _ => throw new AnalysisException("Input argument to rand must be an integer literal.")
+    case _ => throw new AnalysisException("Input argument to randn must be an integer literal.")
   })
 
   override def genCode(ctx: CodegenContext, ev: ExprCode): String = {
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/functions.scala b/sql/core/src/main/scala/org/apache/spark/sql/functions.scala
index e4ab6b4f2348625c51d03a77110a575ab96df565..97c6992e18753055f0544b00908e24b8b0ce0b4f 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/functions.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/functions.scala
@@ -1052,6 +1052,8 @@ object functions extends LegacyFunctions {
   /**
    * Generate a random column with i.i.d. samples from U[0.0, 1.0].
    *
+   * Note that this is indeterministic when data partitions are not fixed.
+   *
    * @group normal_funcs
    * @since 1.4.0
    */
@@ -1068,6 +1070,8 @@ object functions extends LegacyFunctions {
   /**
    * Generate a column with i.i.d. samples from the standard normal distribution.
    *
+   * Note that this is indeterministic when data partitions are not fixed.
+   *
    * @group normal_funcs
    * @since 1.4.0
    */