diff --git a/platform/core-api/src/com/intellij/openapi/components/ProjectComponent.java b/platform/core-api/src/com/intellij/openapi/components/ProjectComponent.java
index f37de284a5ed..d5aa161955dc 100644
--- a/platform/core-api/src/com/intellij/openapi/components/ProjectComponent.java
+++ b/platform/core-api/src/com/intellij/openapi/components/ProjectComponent.java
@@ -1,4 +1,4 @@
-// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.openapi.components;
 
 /**
@@ -12,7 +12,11 @@ package com.intellij.openapi.components;
  * {@link #initComponent()} and {@link #projectOpened()} methods will be called for each project even if user doesn't use any feature of your
  * plugin. So consider using specific extensions instead to ensure that the plugin will not impact IDE performance until user calls its
  * actions explicitly.</strong>
+ *
+ * @deprecated Components are deprecated; please see http://www.jetbrains.org/intellij/sdk/docs/basics/plugin_structure/plugin_components.html for
+ * guidelines on migrating to other APIs.
  */
+@Deprecated
 public interface ProjectComponent extends BaseComponent {
   /**
    * Invoked when the project corresponding to this component instance is opened.<p>
diff --git a/platform/extensions/src/com/intellij/openapi/components/BaseComponent.java b/platform/extensions/src/com/intellij/openapi/components/BaseComponent.java
index 66c805233d8a..ad7258e3ac82 100644
--- a/platform/extensions/src/com/intellij/openapi/components/BaseComponent.java
+++ b/platform/extensions/src/com/intellij/openapi/components/BaseComponent.java
@@ -1,9 +1,13 @@
-// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.openapi.components;
 
 /**
  * The base interface class for all components.
+ *
+ * @deprecated Components are deprecated; please see http://www.jetbrains.org/intellij/sdk/docs/basics/plugin_structure/plugin_components.html for
+ * guidelines on migrating to other APIs.
  */
+@Deprecated
 public interface BaseComponent extends NamedComponent {
   /**
    * @deprecated Use {@link com.intellij.openapi.components.PersistentStateComponent#initializeComponent()} or perform initialization in constructor for non-persistence component.