diff --git a/core/builtins/native/kotlin/Library.kt b/core/builtins/native/kotlin/Library.kt
index fe279a1ec52..db55a0f204d 100644
--- a/core/builtins/native/kotlin/Library.kt
+++ b/core/builtins/native/kotlin/Library.kt
@@ -32,6 +32,8 @@ public operator fun String?.plus(other: Any?): String
 
 /**
  * Returns an array of objects of the given type with the given [size], initialized with null values.
+ *
+ * @throws RuntimeException if the specified [size] is negative.
  */
 public fun <reified @PureReifiable T> arrayOfNulls(size: Int): Array<T?>
 
diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/Arrays.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/Arrays.kt
index 2fab2f3975e..8057d8fd3a5 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/Arrays.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/Arrays.kt
@@ -585,6 +585,8 @@ private class BooleanIteratorImpl(val collection: BooleanArray) : BooleanIterato
 
 /**
  * Returns an array of objects of the given type with the given [size], initialized with null values.
+ *
+ * @throws RuntimeException if the specified [size] is negative.
  */
 public inline fun <reified @PureReifiable T> arrayOfNulls(size: Int): Array<T?> =
         @Suppress("NON_PUBLIC_CALL_FROM_PUBLIC_INLINE")
diff --git a/libraries/stdlib/wasm/builtins/kotlin/Library.kt b/libraries/stdlib/wasm/builtins/kotlin/Library.kt
index 11715166199..451c0052919 100644
--- a/libraries/stdlib/wasm/builtins/kotlin/Library.kt
+++ b/libraries/stdlib/wasm/builtins/kotlin/Library.kt
@@ -27,6 +27,8 @@ public operator fun String?.plus(other: Any?): String = (this ?: "null") + other
 
 /**
  * Returns an array of objects of the given type with the given [size], initialized with null values.
+ *
+ * @throws RuntimeException if the specified [size] is negative.
  */
 // TODO: Should T be reified?
 @Suppress("REIFIED_TYPE_PARAMETER_NO_INLINE")