diff --git a/libraries/stdlib/jdk8/src/kotlin/text/RegexExtensions.kt b/libraries/stdlib/jdk8/src/kotlin/text/RegexExtensions.kt
index 133bbf7e08c..62c51fd875a 100644
--- a/libraries/stdlib/jdk8/src/kotlin/text/RegexExtensions.kt
+++ b/libraries/stdlib/jdk8/src/kotlin/text/RegexExtensions.kt
@@ -23,7 +23,8 @@ package kotlin.text
  * Returns a named group with the specified [name].
  *
  * @return An instance of [MatchGroup] if the group with the specified [name] was matched or `null` otherwise.
- * @throws [UnsupportedOperationException] if getting named groups isn't supported on the current platform.
+ * @throws IllegalArgumentException if there is no group with the specified [name] defined in the regex pattern.
+ * @throws UnsupportedOperationException if getting named groups isn't supported on the current platform.
  */
 @SinceKotlin("1.2")
 public operator fun MatchGroupCollection.get(name: String): MatchGroup? {
diff --git a/libraries/stdlib/src/kotlin/text/regex/MatchResult.kt b/libraries/stdlib/src/kotlin/text/regex/MatchResult.kt
index 2ff24dbed2a..c0e11f0b7c9 100644
--- a/libraries/stdlib/src/kotlin/text/regex/MatchResult.kt
+++ b/libraries/stdlib/src/kotlin/text/regex/MatchResult.kt
@@ -35,6 +35,8 @@ public interface MatchNamedGroupCollection : MatchGroupCollection {
     /**
      * Returns a named group with the specified [name].
      * @return An instance of [MatchGroup] if the group with the specified [name] was matched or `null` otherwise.
+     * @throws IllegalArgumentException if there is no group with the specified [name] defined in the regex pattern.
+     * @throws UnsupportedOperationException if getting named groups isn't supported on the current platform.
      */
     public operator fun get(name: String): MatchGroup?
 }