diff --git a/libraries/stdlib/src/kotlin/coroutines/experimental/intrinsics/IntrinsicsJvm.kt b/libraries/stdlib/src/kotlin/coroutines/experimental/intrinsics/IntrinsicsJvm.kt
index 04385c149fc..6ddfee334ed 100644
--- a/libraries/stdlib/src/kotlin/coroutines/experimental/intrinsics/IntrinsicsJvm.kt
+++ b/libraries/stdlib/src/kotlin/coroutines/experimental/intrinsics/IntrinsicsJvm.kt
@@ -19,6 +19,13 @@
 package kotlin.coroutines.experimental.intrinsics
 import kotlin.coroutines.experimental.*
 
+/**
+ * Starts unintercepted coroutine without receiver and with result type [T] and executes it until its first suspension.
+ * Returns the result of the coroutine or throws its exception if it does not suspend or [COROUTINE_SUSPENDED] if it suspends.
+ * In the later case, the [completion] continuation is invoked when coroutine completes with result or exception.
+ * This function is designed to be used from inside of [suspendCoroutineOrReturn] to resume the execution of suspended
+ * coroutine using a reference to the suspending function.
+ */
 @SinceKotlin("1.1")
 @Suppress("UNCHECKED_CAST")
 @kotlin.internal.InlineOnly
@@ -26,6 +33,13 @@ public inline fun <T> (suspend () -> T).startCoroutineUninterceptedOrReturn(
         completion: Continuation<T>
 ): Any? = (this as Function1<Continuation<T>, Any?>).invoke(completion)
 
+/**
+ * Starts unintercepted coroutine with receiver type [R] and result type [T] and executes it until its first suspension.
+ * Returns the result of the coroutine or throws its exception if it does not suspend or [COROUTINE_SUSPENDED] if it suspends.
+ * In the later case, the [completion] continuation is invoked when coroutine completes with result or exception.
+ * This function is designed to be used from inside of [suspendCoroutineOrReturn] to resume the execution of suspended
+ * coroutine using a reference to the suspending function.
+ */
 @SinceKotlin("1.1")
 @Suppress("UNCHECKED_CAST")
 @kotlin.internal.InlineOnly