diff --git a/package/Invoke-XTapSharingMigration.ps1 b/package/Invoke-XTapSharingMigration.ps1
index 770fc91..1a32c2f 100644
--- a/package/Invoke-XTapSharingMigration.ps1
+++ b/package/Invoke-XTapSharingMigration.ps1
@@ -95,6 +95,13 @@
     Exit codes : 0 = success, 1 = failure, 2 = finished with items to look at (blocked, skipped, not verified,
                  or cancelled at the confirmation).
     Documentation : docs\XTapSharingMigration-Guide.md (or .html)
+
+    This Script is a Personal project.
+    It's provided "AS-IS". It's not an official Microsoft product so no support can be expected from Microsoft.
+
+    As any scripts you must read carefully the documentation and test it first in a Test environment before any run in Production.
+
+    Coordinate every cutover with the partner organizations.
 #>
 [CmdletBinding()]
 param(
diff --git a/package/README.md b/package/README.md
index 24e99d8..4c1c1eb 100644
--- a/package/README.md
+++ b/package/README.md
@@ -49,3 +49,12 @@ notepad .\config\XTapSharingMigration.config.psd1          # Tenant.TenantId, Te
 Project page, releases and change log: https://github.com/Nico77600/XTapSharingMigration
 
 License: [MIT](LICENSE).
+
+## Disclaimer
+
+This Script is a Personal project.
+It's provided "AS-IS". It's not an official Microsoft product so no support can be expected from Microsoft.
+
+As any scripts you must read carefully the documentation and test it first in a Test environment before any run in Production.
+
+Coordinate every cutover with the partner organizations.
diff --git a/tests/XTapSharingMigration.Tests.ps1 b/tests/XTapSharingMigration.Tests.ps1
index c69af22..8cec980 100644
--- a/tests/XTapSharingMigration.Tests.ps1
+++ b/tests/XTapSharingMigration.Tests.ps1
@@ -48,6 +48,33 @@ AfterAll {
     if ($script:Work -and (Test-Path $script:Work)) { Remove-Item $script:Work -Recurse -Force -ErrorAction SilentlyContinue }
 }
 
+Describe 'Disclaimer synchronization' {
+    BeforeAll {
+        $script:DisclaimerPattern = '(?ms)^## Disclaimer\r?\n(?<Text>.*?)(?=^## |\z)'
+        $sections = [regex]::Matches((Get-Content (Join-Path $script:RepoRoot 'README.md') -Raw), $script:DisclaimerPattern)
+        if ($sections.Count -ne 1) { throw 'The root README must have exactly one Disclaimer section.' }
+        $script:Disclaimer = ($sections[0].Groups['Text'].Value -replace "`r`n", "`n").Trim()
+    }
+
+    It 'ships the complete root disclaimer in the runtime README' {
+        $sections = [regex]::Matches((Get-Content (Join-Path $script:Root 'README.md') -Raw), $script:DisclaimerPattern)
+        $sections.Count | Should -Be 1
+        ($sections[0].Groups['Text'].Value -replace "`r`n", "`n").Trim() | Should -BeExactly $script:Disclaimer
+    }
+
+    It 'includes the complete root disclaimer in the entry script help notes' {
+        $errors = $null
+        $ast = [Management.Automation.Language.Parser]::ParseFile((Join-Path $script:Root 'Invoke-XTapSharingMigration.ps1'), [ref]$null, [ref]$errors)
+        $errors | Should -BeNullOrEmpty
+        $help = $ast.GetHelpContent()
+        $help | Should -Not -BeNullOrEmpty
+        $notes = ($help.Notes -replace "`r`n", "`n" -replace '(?m)^[ \t]+', '').Trim()
+        $start = $notes.IndexOf(($script:Disclaimer -split "`n")[0], [StringComparison]::Ordinal)
+        $start | Should -BeGreaterOrEqual 0
+        $notes.Substring($start) | Should -BeExactly $script:Disclaimer
+    }
+}
+
 Describe 'Configuration' {
     It 'loads the delivered configuration file with fictitious tenant values' {
         $script:Settings.Tenant.TenantId | Should -Be $TestTenant.Id