diff --git a/platform/core-api/src/com/intellij/openapi/startup/StartupManager.java b/platform/core-api/src/com/intellij/openapi/startup/StartupManager.java
index 66a6b9196a4a..74f2368020bd 100644
--- a/platform/core-api/src/com/intellij/openapi/startup/StartupManager.java
+++ b/platform/core-api/src/com/intellij/openapi/startup/StartupManager.java
@@ -1,6 +1,7 @@
 // Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.openapi.startup;
 
+import com.intellij.openapi.project.DumbAware;
 import com.intellij.openapi.project.Project;
 import kotlinx.coroutines.Job;
 import org.jetbrains.annotations.ApiStatus;
@@ -10,39 +11,35 @@ import org.jetbrains.annotations.NotNull;
  * Allows registering activities that are run during project loading.
  *
  * @see ProjectActivity
- * @see StartupActivity
+ * @see <a href="https://plugins.jetbrains.com/docs/intellij/plugin-components.html#project-open">IntelliJ Platform Docs</a>
  */
 public abstract class StartupManager {
   /**
-   * Returns the startup manager instance for the specified project.
-   *
-   * @param project the project for which the instance should be returned.
-   * @return the startup manager instance.
+   * @return Startup manager instance for the specified project.
    */
   public static StartupManager getInstance(@NotNull Project project) {
     return project.getService(StartupManager.class);
   }
 
   /**
-   * Registers an activity that is performed during project load while the "Loading Project"
-   * progress bar is displayed. You may NOT access the PSI structures from the activity.
+   * Registers an activity that is performed during the project load while the "Loading Project"
+   * progress bar is displayed.
+   * You may NOT access PSI from this activity.
    */
   @ApiStatus.Internal
   public abstract void registerStartupActivity(@NotNull Runnable runnable);
 
   /**
-   * @deprecated Use {@link #runAfterOpened}.
+   * @deprecated Consider using extension point {@link ProjectActivity} instead.
    */
   @Deprecated
   public abstract void registerPostStartupActivity(@NotNull Runnable runnable);
 
   /**
-   * Registers activity that is executed on pooled thread after project is opened.
-   * The runnable will be executed in current thread if project is already opened.</p>
-   * <p>
-   * See <a href="https://github.com/JetBrains/intellij-community/blob/master/platform/service-container/overview.md#startup-activity">docs</a> for details.
-   * <p>
-   * Consider using extension point {@link ProjectActivity}/{@link StartupActivity} instead.
+   * Registers activity that is executed on pooled thread after the project is opened.
+   * The runnable will be executed in the current thread if the project is already opened.
+   *
+   * @implNote Consider using extension point {@link ProjectActivity} instead.
    */
   @ApiStatus.Internal
   public abstract void runAfterOpened(@NotNull Runnable runnable);
@@ -50,15 +47,15 @@ public abstract class StartupManager {
   public abstract boolean postStartupActivityPassed();
 
   /**
-   * Registers activity that is executed after project is opened.
+   * Registers activity that is executed after the project is opened.
    * If runnable implements {@link DumbAware}, it will be executed on EDT thread in a non-modal state.
    * Otherwise, it will be executed on EDT when indexes are ready.
    * <p>
-   * The runnable can be executed immediately if method is called from EDT and project is already opened.
-   * <p>
+   * The runnable can be executed immediately if the method is called from EDT and the project is already opened.
    *
-   * @deprecated Use {@link #runAfterOpened}.
+   * @deprecated Consider using extension point {@link ProjectActivity} instead.
    */
+  @Deprecated
   public abstract void runWhenProjectIsInitialized(@NotNull Runnable runnable);
 
   @ApiStatus.Internal