diff --git a/topics/tutorials/using_kotlin.md b/topics/tutorials/using_kotlin.md
index 8d9a0caf1..1787beb69 100644
--- a/topics/tutorials/using_kotlin.md
+++ b/topics/tutorials/using_kotlin.md
@@ -172,6 +172,8 @@ When registering an extension, the platform uses a dependency injection framewor
 For this reason, plugins *must not* use [Kotlin objects](https://kotlinlang.org/docs/object-declarations.html#object-declarations-overview) (`object` keyword) to implement any <path>[plugin.xml](plugin_configuration_file.md)</path> declarations.
 Managing the lifecycle of extensions is the platform responsibility and instantiating these classes as Kotlin singletons may cause issues.
 
+A notable exception is `com.intellij.openapi.fileTypes.FileType` (`com.intellij.fileType` extension point), see also the inspection descriptions below.
+
 Problems are highlighted via these inspections (2023.2):
 - <control>Plugin DevKit | Code | Kotlin object registered as extension</control> for Kotlin code
 - <control>Plugin DevKit | Plugin descriptor | Extension class is a Kotlin object</control> for <path>plugin.xml</path>