diff --git a/scripts/Set-CCMCert.ps1 b/scripts/Set-CCMCert.ps1
index 1ff5c0f..07a2596 100644
--- a/scripts/Set-CCMCert.ps1
+++ b/scripts/Set-CCMCert.ps1
@@ -10,14 +10,23 @@ Thumbprint value of the certificate you would like the Chocolatey Central Manage
 Please make sure the certificate is located in both the Cert:\LocalMachine\TrustedPeople\ and Cert:\LocalMachine\My certificate stores.
 
 .EXAMPLE
-PS> .\Set-CCMCert.ps1 -CertificateThumbprint 'Your_Certificate_Thumbprint_Value'
+PS> .\Set-CCMCert.ps1 -Thumbprint 'Your_Certificate_Thumbprint_Value'
 #>
 
 [CmdletBinding()]
 param(
     [Parameter(Mandatory)]
-    [String]
-    $CertificateThumbprint
+    [ArgumentCompleter({
+        Get-ChildItem Cert:\LocalMachine\My | ForEach-Object {
+            [System.Management.Automation.CompletionResult]::new(
+                $_.Thumbprint,
+                $_.Thumbprint,
+                'ParameterValue',
+                $_.FriendlyName
+            )
+        }
+    })]
+    [string]$Thumbprint
 )
 
 begin {
diff --git a/scripts/Set-JenkinsCert.ps1 b/scripts/Set-JenkinsCert.ps1
index 0193ae0..e802e23 100644
--- a/scripts/Set-JenkinsCert.ps1
+++ b/scripts/Set-JenkinsCert.ps1
@@ -11,6 +11,16 @@
 param(
     # Thumbprint of the certificate stored in the Trusted People cert-store.
     [Parameter(Mandatory)]
+    [ArgumentCompleter({
+        Get-ChildItem Cert:\LocalMachine\My | ForEach-Object {
+            [System.Management.Automation.CompletionResult]::new(
+                $_.Thumbprint,
+                $_.Thumbprint,
+                'ParameterValue',
+                $_.FriendlyName
+            )
+        }
+    })]
     [string]$Thumbprint,
 
     # Port number to use for Jenkins HTTPS.
diff --git a/scripts/Set-NexusCert.ps1 b/scripts/Set-NexusCert.ps1
index 4a00397..44cc300 100644
--- a/scripts/Set-NexusCert.ps1
+++ b/scripts/Set-NexusCert.ps1
@@ -12,14 +12,22 @@ Thumbprint value of certificate you want to run Nexus on. Make sure certificate
 Port you have Nexus configured to run on.
 
 .EXAMPLE
-PS> .\Set-NexusCert.ps1 -Thumbprint 'Your_Certificate_Thumbprint_Value' -NexusPort 'Port_Number'
+PS> .\Set-NexusCert.ps1 -Thumbprint 'Your_Certificate_Thumbprint_Value' -Port 'Port_Number'
 #>
 
 [CmdletBinding()]
 param(
     [Parameter(Mandatory)]
-    [string]
-    $Thumbprint,
+    [ArgumentCompleter({
+        Get-ChildItem Cert:\LocalMachine\My | ForEach-Object {
+            [System.Management.Automation.CompletionResult]::new(
+                $_.Thumbprint,
+                $_.Thumbprint,
+                'ParameterValue',
+                $_.FriendlyName
+            )
+        }
+    })]
     [string]$Thumbprint,
 
     [Parameter()]