diff --git a/powershell-adapter/psDscAdapter/powershell.resource.ps1 b/powershell-adapter/psDscAdapter/powershell.resource.ps1
index b26947705..1fcfe2224 100644
--- a/powershell-adapter/psDscAdapter/powershell.resource.ps1
+++ b/powershell-adapter/psDscAdapter/powershell.resource.ps1
@@ -2,7 +2,7 @@
 # Licensed under the MIT License.
 [CmdletBinding()]
 param(
-    [Parameter(Mandatory = $true, Position = 0, HelpMessage = 'Operation to perform. Choose from List, Get, Set, Test, Export, Validate.')]
+    [Parameter(Mandatory = $true, Position = 0, HelpMessage = 'Operation to perform. Choose from List, Get, Set, Test, Export, Validate, ClearCache.')]
     [ValidateSet('List', 'Get', 'Set', 'Test', 'Export', 'Validate', 'ClearCache')]
     [string]$Operation,
     [Parameter(Mandatory = $false, Position = 1, ValueFromPipeline = $true, HelpMessage = 'Configuration or resource input in JSON format.')]