diff --git a/topics/basics/architectural_overview/documents.md b/topics/basics/architectural_overview/documents.md
index 55dae901f..db572bb38 100644
--- a/topics/basics/architectural_overview/documents.md
+++ b/topics/basics/architectural_overview/documents.md
@@ -1,6 +1,8 @@
-[//]: # (title: Documents)
+<!-- Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
 
-<!-- Copyright 2000-2022 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
+# Documents
+
+<link-summary>Introduction to documents - an editable sequence of Unicode characters, typically storing the content of a virtual file.</link-summary>
 
 A [`Document`](%gh-ic%/platform/core-api/src/com/intellij/openapi/editor/Document.java) is an editable sequence of Unicode characters, typically corresponding to the text contents of a [virtual file](virtual_file.md).
 
diff --git a/topics/basics/indexing_and_psi_stubs/stub_indexes.md b/topics/basics/indexing_and_psi_stubs/stub_indexes.md
index 705f22e8f..9b213cbe1 100644
--- a/topics/basics/indexing_and_psi_stubs/stub_indexes.md
+++ b/topics/basics/indexing_and_psi_stubs/stub_indexes.md
@@ -1,6 +1,8 @@
+<!-- Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
+
 # Stub Indexes
 
-<!-- Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
+<link-summary>Creating stub indexes containing PSI tree fragments, which allow searching for PSI elements without parsing files.</link-summary>
 
 ## Stub Trees
 
diff --git a/topics/basics/plugin_signing.md b/topics/basics/plugin_signing.md
index 2c42c865a..bd4234f71 100644
--- a/topics/basics/plugin_signing.md
+++ b/topics/basics/plugin_signing.md
@@ -1,6 +1,8 @@
+<!-- Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
+
 # Plugin Signing
 
-<!-- Copyright 2000-2023 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
+<link-summary>Plugin signing ensures that end users get unmodified plugin distribution that was actually published to JetBrains Marketplace.</link-summary>
 
 Plugin Signing is a mechanism introduced in the 2021.2 release cycle to increase security in [JetBrains Marketplace](https://plugins.jetbrains.com) and all of our IntelliJ-based IDEs.
 
diff --git a/topics/reference_guide/custom_language_support/language_injection.md b/topics/reference_guide/custom_language_support/language_injection.md
index c636eb5c5..05fabe84d 100644
--- a/topics/reference_guide/custom_language_support/language_injection.md
+++ b/topics/reference_guide/custom_language_support/language_injection.md
@@ -1,7 +1,9 @@
-<!-- Copyright 2000-2022 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
+<!-- Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
 
 # Language Injection
 
+<link-summary>Injecting a language into different language elements.</link-summary>
+
 <tldr>
 
 **Product Help:** [Language injections](https://www.jetbrains.com/help/idea/language-injections-settings.html)
diff --git a/topics/reference_guide/project_model/project.md b/topics/reference_guide/project_model/project.md
index 7ab377ed8..76d120ca2 100644
--- a/topics/reference_guide/project_model/project.md
+++ b/topics/reference_guide/project_model/project.md
@@ -1,6 +1,8 @@
-[//]: # (title: Project)
+<!-- Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
 
-<!-- Copyright 2000-2022 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
+# Project
+
+<link-summary>Introduction to projects and their structure. Retrieving and modifying project setup.</link-summary>
 
 <tldr>