diff --git a/functions/Find-YouTubeVideo.ps1 b/functions/Find-YouTubeVideo.ps1
index 41035e5..80cd13f 100644
--- a/functions/Find-YouTubeVideo.ps1
+++ b/functions/Find-YouTubeVideo.ps1
@@ -3,6 +3,7 @@ function Find-YouTubeVideo {
   param (
     [Parameter(Mandatory = $true)]
     [string] $Query,
+    [ValidateNotNullOrEmpty()]
     [string] $PageToken,
     [switch] $Raw
   )
@@ -17,4 +18,4 @@ function Find-YouTubeVideo {
 
   $Result.Items | ForEach-Object -Process { $PSItem.PSTypeNames.Add('YouTube.VideoResult') }
   $Result.Items
-}
\ No newline at end of file
+}