diff --git a/kotlinx-coroutines-core/common/src/CloseableCoroutineDispatcher.kt b/kotlinx-coroutines-core/common/src/CloseableCoroutineDispatcher.kt
index 2813423675..cc56121f02 100644
--- a/kotlinx-coroutines-core/common/src/CloseableCoroutineDispatcher.kt
+++ b/kotlinx-coroutines-core/common/src/CloseableCoroutineDispatcher.kt
@@ -6,6 +6,9 @@ package kotlinx.coroutines
  * associated with the current dispatcher.
  * Examples of closeable dispatchers are dispatchers backed by `java.lang.Executor` and
  * by `kotlin.native.Worker`.
+ *
+ * **The `CloseableCoroutineDispatcher` class is not stable for inheritance in 3rd party libraries**, as new methods
+ * might be added to this interface in the future, but is stable for use.
  */
 @ExperimentalCoroutinesApi
 public expect abstract class CloseableCoroutineDispatcher() : CoroutineDispatcher, AutoCloseable {