diff --git a/platform/platform-impl/src/com/intellij/codeInsight/inline/completion/InlineCompletionHandler.kt b/platform/platform-impl/src/com/intellij/codeInsight/inline/completion/InlineCompletionHandler.kt
index 3e5a3095be3b..b12ca7c2896f 100644
--- a/platform/platform-impl/src/com/intellij/codeInsight/inline/completion/InlineCompletionHandler.kt
+++ b/platform/platform-impl/src/com/intellij/codeInsight/inline/completion/InlineCompletionHandler.kt
@@ -86,7 +86,9 @@ abstract class InlineCompletionHandler @ApiStatus.Internal constructor(
     invalidationListeners.addListener(logsListener)
   }
 
-  // TODO docs
+  /**
+   * Frontend always starts a session. Backend never starts a session. Instead, the backend will send a notification to the frontend.
+   */
   @ApiStatus.Internal
   @ApiStatus.NonExtendable
   protected abstract fun startSessionOrNull(