diff --git a/WoofWare.NUnitTestRunner.Lib/SurfaceBaseline.txt b/WoofWare.NUnitTestRunner.Lib/SurfaceBaseline.txt
index be778eb..19db0cb 100644
--- a/WoofWare.NUnitTestRunner.Lib/SurfaceBaseline.txt
+++ b/WoofWare.NUnitTestRunner.Lib/SurfaceBaseline.txt
@@ -358,10 +358,12 @@ WoofWare.NUnitTestRunner.TrxOutcome.Parse [static method]: string -> WoofWare.NU
 WoofWare.NUnitTestRunner.TrxOutcome.Tag [property]: [read-only] int
 WoofWare.NUnitTestRunner.TrxOutcome.Warning [static property]: [read-only] WoofWare.NUnitTestRunner.TrxOutcome
 WoofWare.NUnitTestRunner.TrxOutput inherit obj, implements WoofWare.NUnitTestRunner.TrxOutput System.IEquatable, System.Collections.IStructuralEquatable
-WoofWare.NUnitTestRunner.TrxOutput..ctor [constructor]: (string option, WoofWare.NUnitTestRunner.TrxErrorInfo option)
+WoofWare.NUnitTestRunner.TrxOutput..ctor [constructor]: (string option, string option, WoofWare.NUnitTestRunner.TrxErrorInfo option)
 WoofWare.NUnitTestRunner.TrxOutput.ErrorInfo [property]: [read-only] WoofWare.NUnitTestRunner.TrxErrorInfo option
 WoofWare.NUnitTestRunner.TrxOutput.get_ErrorInfo [method]: unit -> WoofWare.NUnitTestRunner.TrxErrorInfo option
+WoofWare.NUnitTestRunner.TrxOutput.get_StdErr [method]: unit -> string option
 WoofWare.NUnitTestRunner.TrxOutput.get_StdOut [method]: unit -> string option
+WoofWare.NUnitTestRunner.TrxOutput.StdErr [property]: [read-only] string option
 WoofWare.NUnitTestRunner.TrxOutput.StdOut [property]: [read-only] string option
 WoofWare.NUnitTestRunner.TrxReport inherit obj, implements WoofWare.NUnitTestRunner.TrxReport System.IEquatable, System.Collections.IStructuralEquatable
 WoofWare.NUnitTestRunner.TrxReport..ctor [constructor]: (System.Guid, string, WoofWare.NUnitTestRunner.TrxReportTimes, WoofWare.NUnitTestRunner.TrxTestSettings, WoofWare.NUnitTestRunner.TrxUnitTestResult list, WoofWare.NUnitTestRunner.TrxUnitTest list, WoofWare.NUnitTestRunner.TrxTestEntry list, WoofWare.NUnitTestRunner.TrxTestListEntry list, WoofWare.NUnitTestRunner.TrxResultsSummary)
diff --git a/WoofWare.NUnitTestRunner.Lib/TrxReport.fs b/WoofWare.NUnitTestRunner.Lib/TrxReport.fs
index 96614b6..3b11151 100644
--- a/WoofWare.NUnitTestRunner.Lib/TrxReport.fs
+++ b/WoofWare.NUnitTestRunner.Lib/TrxReport.fs
@@ -290,6 +290,8 @@ type TrxOutput =
     {
         /// What the entity printed to standard output.
         StdOut : string option
+        /// What the entity printed to standard error.
+        StdErr : string option
         /// Description of any error the entity encountered.
         ErrorInfo : TrxErrorInfo option
     }
@@ -305,6 +307,14 @@ type TrxOutput =
             childNode.AppendChild text |> ignore<XmlNode>
             node.AppendChild childNode |> ignore<XmlNode>
 
+        match this.StdErr with
+        | None -> ()
+        | Some stderr ->
+            let text = doc.CreateTextNode stderr
+            let childNode = doc.CreateElement ("StdErr", XmlUtil.NS)
+            childNode.AppendChild text |> ignore<XmlNode>
+            node.AppendChild childNode |> ignore<XmlNode>
+
         match this.ErrorInfo with
         | None -> ()
         | Some errInfo -> node.AppendChild (errInfo.toXml doc) |> ignore<XmlNode>
@@ -317,6 +327,11 @@ type TrxOutput =
             | NodeWithNamedChild "StdOut" (OneChildNode "StdOut" (NoChildrenNode stdout)) -> Some stdout
             | _ -> None
 
+        let stderr =
+            match node with
+            | NodeWithNamedChild "StdErr" (OneChildNode "StdErr" (NoChildrenNode stdout)) -> Some stdout
+            | _ -> None
+
         let errorInfo =
             match node with
             | NodeWithNamedChild "ErrorInfo" node ->
@@ -330,6 +345,7 @@ type TrxOutput =
         | Ok errorInfo ->
             {
                 StdOut = stdout
+                StdErr = stderr
                 ErrorInfo = errorInfo
             }
             |> Ok
diff --git a/WoofWare.NUnitTestRunner.Lib/version.json b/WoofWare.NUnitTestRunner.Lib/version.json
index e128f3c..16bed39 100644
--- a/WoofWare.NUnitTestRunner.Lib/version.json
+++ b/WoofWare.NUnitTestRunner.Lib/version.json
@@ -1,5 +1,5 @@
 {
-  "version": "0.10",
+  "version": "0.11",
   "publicReleaseRefSpec": [
     "^refs/heads/main$"
   ],
@@ -8,4 +8,4 @@
     ":/Directory.Build.props",
     ":/README.md"
   ]
-}
\ No newline at end of file
+}
diff --git a/WoofWare.NUnitTestRunner/Program.fs b/WoofWare.NUnitTestRunner/Program.fs
index f78a777..99a8c15 100644
--- a/WoofWare.NUnitTestRunner/Program.fs
+++ b/WoofWare.NUnitTestRunner/Program.fs
@@ -174,6 +174,7 @@ module Program =
                 Output =
                     {
                         StdOut = None
+                        StdErr = None
                         ErrorInfo = None
                     }
                 RunInfos =
@@ -277,11 +278,11 @@ module Program =
                     Output =
                         match i.StdOut, i.StdErr, exc with
                         | None, None, None -> None
-                        // TODO surely stderr can be emitted
-                        | stdout, _stderr, exc ->
+                        | stdout, stderr, exc ->
                             Some
                                 {
                                     TrxOutput.StdOut = stdout
+                                    StdErr = stderr
                                     ErrorInfo = exc
                                 }
                 }
diff --git a/WoofWare.NUnitTestRunner/WoofWare.NUnitTestRunner.Test/TestTrx.fs b/WoofWare.NUnitTestRunner/WoofWare.NUnitTestRunner.Test/TestTrx.fs
index 5df561e..fd446b9 100644
--- a/WoofWare.NUnitTestRunner/WoofWare.NUnitTestRunner.Test/TestTrx.fs
+++ b/WoofWare.NUnitTestRunner/WoofWare.NUnitTestRunner.Test/TestTrx.fs
@@ -197,6 +197,7 @@ Running all tests in /Users/patrick/Documents/GitHub/TestRunner/TestRunner/TestR
 Ensure version is monotonic: Not yet published
 NUnit Adapter 4.5.0.0: Test execution complete
 """
+                        StdErr = None
                         ErrorInfo = None
                     }
                 Outcome = TrxOutcome.Failed