diff --git a/topics/appendix/api_notable/api_notable_list_2024.md b/topics/appendix/api_notable/api_notable_list_2024.md
index 15eb709f5..986b46b6a 100644
--- a/topics/appendix/api_notable/api_notable_list_2024.md
+++ b/topics/appendix/api_notable/api_notable_list_2024.md
@@ -15,6 +15,9 @@ _Early Access Program_ (EAP) releases of upcoming versions are available [here](
 Dumb-aware intentions and quick-fixes
 : Mark implementations as enabled during indexing, see [](indexing_and_psi_stubs.md#DumbAwareAPI).
 
+Testing: `ProjectActivity`
+: Executed asynchronously now during tests, see FAQ entry [](testing_faq.md#how-to-handle-projectactivity).
+
 ## 2024.1
 
 ### IntelliJ Platform 2024.1
diff --git a/topics/basics/testing_plugins/testing_faq.md b/topics/basics/testing_plugins/testing_faq.md
index beed61234..756a28597 100644
--- a/topics/basics/testing_plugins/testing_faq.md
+++ b/topics/basics/testing_plugins/testing_faq.md
@@ -78,6 +78,8 @@ Use _ordered_ collections or [`UsefulTestCase.assertUnorderedCollection()`](%gh-
 Code deferring execution (e.g., via `Application.invokeLater()`) might not run during test execution (and possibly fails in production, too).
 Use `Application.invokeLater(runnable, myProject.getDisposed())`.
 
+When targeting 2024.2 or later, see also [](#how-to-handle-projectactivity).
+
 ### How to avoid test failure when using resources?
 
 In some situations, added or changed files (e.g. XML DTDs provided by a plugin) are not refreshed in [](virtual_file_system.md).
@@ -217,4 +219,10 @@ PsiTestUtil.addLibrary(model,
     "internal-library", getTestDataPath(), "internal-library-2.0.jar");
 ```
 
+### How to handle `ProjectActivity`?
+
+Since 2024.2, [`ProjectActivity`](%gh-ic%/platform/core-api/src/com/intellij/openapi/startup/StartupActivity.kt) are no longer awaited on project open in tests.
+If tests depend on some job done in `ProjectActivity` (e.g., automatic project re-import), implement a dedicated [event/listener](messaging_infrastructure.md) and wait for it explicitly.
+As a workaround, use [`StartupActivityTestUtil.waitForProjectActivitiesToComplete()`](%gh-ic-master%/platform/testFramework/src/com/intellij/testFramework/StartupActivityTestUtil.kt).
+
 <include from="snippets.md" element-id="missingContent"/>