diff --git a/source/Public/Sync-CISExcelAndCsvData.ps1 b/source/Public/Sync-CISExcelAndCsvData.ps1
index 378aba4..22d84b4 100644
--- a/source/Public/Sync-CISExcelAndCsvData.ps1
+++ b/source/Public/Sync-CISExcelAndCsvData.ps1
@@ -34,12 +34,14 @@ function Sync-CISExcelAndCsvData {
     [CmdletBinding()]
     param (
         [Parameter(Mandatory = $true)]
+        [ValidateScript({ Test-Path $_ })]
         [string]$ExcelPath,
 
         [Parameter(Mandatory = $true)]
         [string]$WorksheetName,
 
         [Parameter(Mandatory = $true)]
+        [ValidateScript({ Test-Path $_ })]
         [string]$CsvPath,
 
         [Parameter(Mandatory = $false)]