diff --git a/topics/basics/architectural_overview/documents.md b/topics/basics/architectural_overview/documents.md
index 288d13731..dd4f436c5 100644
--- a/topics/basics/architectural_overview/documents.md
+++ b/topics/basics/architectural_overview/documents.md
@@ -65,3 +65,7 @@ See also [Working with Text](working_with_text.md#safely-replacing-selected-text
 [`DocumentUtil`](%gh-ic%/platform/core-impl/src/com/intellij/util/DocumentUtil.java) contains utility methods for `Document` processing.
 This allows you to get information like the text offsets of particular lines.
 This is particularly useful when you need text location/offset information about a given `PsiElement`.
+
+## How can I mark a region as read-only?
+
+Use `Document.createGuardedBlock()`.
diff --git a/topics/basics/faq.md b/topics/basics/faq.md
index 691955710..f7e649939 100644
--- a/topics/basics/faq.md
+++ b/topics/basics/faq.md
@@ -36,7 +36,6 @@ for programmatic registration.
 
 * [Why doesn't the file change on disk after I changed it through the PSI?](https://intellij-support.jetbrains.com/hc/en-us/community/posts/206791625-Action-doesn-t-see-changes-in-xml-file)
 * [Can I hook into the file save logic?](https://intellij-support.jetbrains.com/hc/en-us/community/posts/206790685-Can-you-tie-into-the-file-save-logic-)
-* [Can I mark a part of a file as read-only?](https://intellij-support.jetbrains.com/hc/en-us/community/posts/207042355-Read-only-section-in-editor)
 * [How do I control what happens when the user tries to edit such a part?](https://intellij-support.jetbrains.com/hc/en-us/community/posts/206791375-Using-locked-regions)
 * [How can I show several editors for a single file in tabs?](https://intellij-support.jetbrains.com/hc/en-us/community/posts/206795495-Alternative-Editors-ala-HTML-Preview)
 * [Can I open an editor which has no underlying file on disk?](https://intellij-support.jetbrains.com/hc/en-us/community/posts/206135449-Create-an-Editor-for-a-non-physical-file)