diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8db234b..d09ee3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@
 
 - Send events synchronously so they're not lost when the script exits ([#39](https://github.com/getsentry/sentry-powershell/pull/39))
 
+### Fixes
+
+- Transaction sampling ([#38](https://github.com/getsentry/sentry-powershell/pull/41))
+
 ## 0.0.2
 
 ### Various fixes & improvements
diff --git a/modules/Sentry/public/Start-SentryTransaction.ps1 b/modules/Sentry/public/Start-SentryTransaction.ps1
index 7f11381..59a5b61 100644
--- a/modules/Sentry/public/Start-SentryTransaction.ps1
+++ b/modules/Sentry/public/Start-SentryTransaction.ps1
@@ -6,9 +6,11 @@ function Start-SentryTransaction
         [Parameter(Mandatory, ParameterSetName = 'Basic', Position = 0)]
         [Parameter(Mandatory, ParameterSetName = 'BasicWithDescription', Position = 0)]
         [string] $Name,
+
         [Parameter(Mandatory, ParameterSetName = 'Basic', Position = 1)]
         [Parameter(Mandatory, ParameterSetName = 'BasicWithDescription', Position = 1)]
         [string] $Operation,
+
         [Parameter(ParameterSetName = 'BasicWithDescription', Position = 2)]
         [string] $Description = $null,
 
@@ -20,15 +22,22 @@ function Start-SentryTransaction
         [Parameter(ParameterSetName = 'TransactionContext', Position = 1)]
         [hashtable] $CustomSamplingContext,
 
-        [Parameter()]
-        [switch] $ForceSampled = $false
+        [Parameter(ParameterSetName = 'Basic')]
+        [Parameter(ParameterSetName = 'BasicWithDescription')]
+        [Parameter(ParameterSetName = 'TransactionContext')]
+        [switch] $ForceSampled
     )
 
     begin
     {
         if ($null -eq $TransactionContext)
         {
-            $TransactionContext = [Sentry.TransactionContext]::new($Name, $Operation, $null, $null, $null, $Description, $null, $ForceSampled)
+            $IsSampled = $null
+            if ($ForceSampled)
+            {
+                $IsSampled = $true
+            }
+            $TransactionContext = [Sentry.TransactionContext]::new($Name, $Operation, $null, $null, $null, $Description, $null, $IsSampled)
         }
 
     }
diff --git a/samples/locate-city.ps1 b/samples/locate-city.ps1
index 55d6c15..70cc4b0 100644
--- a/samples/locate-city.ps1
+++ b/samples/locate-city.ps1
@@ -19,15 +19,26 @@ param([string]$City = '')
 Import-Module $PSScriptRoot/../modules/Sentry/Sentry.psd1
 
 # Start the Sentry client.
-Start-Sentry 'https://eb18e953812b41c3aeb042e666fd3b5c@o447951.ingest.sentry.io/5428537'
+Start-Sentry -Debug {
+    $_.Dsn = 'https://eb18e953812b41c3aeb042e666fd3b5c@o447951.ingest.sentry.io/5428537'
+    $_.TracesSampleRate = 1.0
+}
+
+# Transaction can be started by providing, at minimum, the name and the operation
+$transaction = Start-SentryTransaction 'transaction-name' 'transaction-operation'
 
 try
 {
+    $span = $transaction.StartChild('wait for input')
     if ($City -eq '' ) { $City = Read-Host 'Enter the city name' }
+    $span.Finish()
 
+    $span = $transaction.StartChild('read CSV')
     Write-Progress 'Reading worldcities.csv...'
     $Table = Import-Csv "$PSScriptRoot/../data/worldcities.csv"
+    $span.Finish()
 
+    $span = $transaction.StartChild('search')
     $FoundOne = 0
     foreach ($Row in $Table)
     {
@@ -42,6 +53,7 @@ try
             Write-Host "* $City ($Country, $Region, population $Population) is at $Lat°N, $Long°W"
         }
     }
+    $span.Finish()
 
     if ($FoundOne)
     {
@@ -54,5 +66,9 @@ catch
 {
     $_ | Out-Sentry
     "⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
-    exit 1
+}
+finally
+{
+    # Mark the transaction as finished and send it to Sentry
+    $transaction.Finish()
 }
diff --git a/tests/traces.tests.ps1 b/tests/traces.tests.ps1
index 24fa03d..bf0fc0a 100644
--- a/tests/traces.tests.ps1
+++ b/tests/traces.tests.ps1
@@ -97,4 +97,43 @@ Describe 'Start-SentryTransaction' {
 
         $global:TraceSamplerExecuted | Should -Be $true
     }
+
+    It 'sets IsSampled correctly based on ForceSampled, with tracing disabled' -ForEach @($true, $false) {
+        $ForceSampled = $_
+
+        Start-Sentry {
+            $_.Dsn = 'https://key@127.0.0.1/1'
+        }
+
+        if ($ForceSampled)
+        {
+            $transaction = Start-SentryTransaction 'foo' 'bar' -ForceSampled
+            $transaction.IsSampled | Should -Be $true
+        }
+        else
+        {
+            $transaction = Start-SentryTransaction 'foo' 'bar'
+            $transaction.IsSampled | Should -Be $false
+        }
+    }
+
+    It 'sets IsSampled correctly based on ForceSampled, with tracing enabled' -ForEach @($true, $false) {
+        $ForceSampled = $_
+
+        Start-Sentry {
+            $_.Dsn = 'https://key@127.0.0.1/1'
+            $_.TracesSampleRate = 1.0
+        }
+
+        if ($ForceSampled)
+        {
+            $transaction = Start-SentryTransaction 'foo' 'bar' -ForceSampled
+            $transaction.IsSampled | Should -Be $true
+        }
+        else
+        {
+            $transaction = Start-SentryTransaction 'foo' 'bar'
+            $transaction.IsSampled | Should -Be $true
+        }
+    }
 }