1 files changed, 6 insertions, 1 deletions
diff --git a/jprov/runner.py b/jprov/runner.py
index 88dfe7f..0f0a629 100644
--- a/jprov/runner.py
+++ b/jprov/runner.py
@@ -58,6 +58,11 @@ def run(
                 fh.write(stderr)
 
     if proc.returncode != 0 and not allow_fail:
-        raise RuntimeError(f"command failed: {' '.join(cmd_list)} (exit {proc.returncode})")
+        detail = ""
+        if stderr:
+            detail = f" stderr: {stderr.strip()}"
+        raise RuntimeError(
+            f"command failed: {' '.join(cmd_list)} (exit {proc.returncode}){detail}"
+        )
 
     return RunResult(cmd=cmd_list, returncode=proc.returncode, stdout=stdout, stderr=stderr)