diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 8edf0f8..e57028a 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -15,6 +15,9 @@
 == v0.28.0
 
 * *Migrated to a flat config*.
+** Temporarily removed support for optional configs.
+All plugins are required.
++
 * *Using `typescript-eslint` package instead of `@typescript-eslint/*`*.
 +
 * Updated `typescript-eslint` to `8.16.0`:
diff --git a/MIGRATION_GUIDE.adoc b/MIGRATION_GUIDE.adoc
index f73311b..c4ee877 100644
--- a/MIGRATION_GUIDE.adoc
+++ b/MIGRATION_GUIDE.adoc
@@ -9,13 +9,22 @@ Migration between minor versions follows the same steps:
 ** fix errors or check auto-fixes of warnings;
 ** check for the regressions.
 
-== From `v0.27.1` to `0.28.0`
+== From `v0.27.1` to `v0.28.0`
 
 * Remove obsolete peer dependencies:
 ** `@typescript-eslint/eslint-plugin` (replaced by `typescript-eslint`)
 ** `@typescript-eslint/parser`
 ** `eslint-plugin-sonarjs`
 +
+* *Temporarily* install _optional_ dependencies:
++
+** `eslint-plugin-cypress`
+** `eslint-plugin-jest
+** `eslint-plugin-jest-dom`
+** `eslint-plugin-jest-formatting`
+** `eslint-plugin-rxjs`
+** `eslint-plugin-testing-library`
++
 * Rename `.eslintrc.js` into `eslint.config.js`
 ** Change configuration structure.
 +