diff --git a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Annotations.kt b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Annotations.kt
index 45d534c8731..13a5f252d19 100644
--- a/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Annotations.kt
+++ b/kotlin-native/Interop/Runtime/src/main/kotlin/kotlinx/cinterop/Annotations.kt
@@ -39,10 +39,12 @@ public annotation class UnsafeNumber(val actualPlatformTypes: Array<String>)
 public annotation class BetaInteropApi
 
 /**
- * Marks foreign-memory-related API as experimental.
+ * Marks foreign-language-related API as experimental.
  *
  * Foreign API includes all operations and classifiers that are required for operating with
  * unmanaged and foreign memory, including but not limited to such declarations as [CPointer], [CPointed], [StableRef], and `Pinned`.
+ * It also includes API of C and Objective-C libraries, except for those that are available in Kotlin by default
+ * (like `platform.posix.*` or `platform.Foundation.*`).
  *
  * Such API is considered experimental and has the following known limitations and caveats:
  * - It is either undocumented or lacks extensive and sound description.