diff --git a/kotlin_demo/src/HelloAction.kt b/kotlin_demo/src/HelloAction.kt
index d861598a6..7ddc6d7bb 100644
--- a/kotlin_demo/src/HelloAction.kt
+++ b/kotlin_demo/src/HelloAction.kt
@@ -3,6 +3,7 @@ import com.intellij.openapi.actionSystem.AnActionEvent
 import com.intellij.openapi.actionSystem.PlatformDataKeys
 import com.intellij.openapi.ui.Messages
 
+//[Markdown reference](/tutorials/kotlin.md)
 class HelloAction : AnAction("Hello") {
     override fun actionPerformed(event: AnActionEvent) {
         val project = event.getData(PlatformDataKeys.PROJECT)