1 files changed, 1 insertions, 1 deletions
diff --git a/examples/chroottar.py b/examples/chroottar.py
index 49d9a7d..b210649 100755
--- a/examples/chroottar.py
+++ b/examples/chroottar.py
@@ -34,7 +34,7 @@ class TarFile(tarfile.TarFile):
         fileobj: typing.BinaryIO | None = None,
     ) -> tarfile.TarFile:
         if mode not in ("r", "w", "x"):
-            raise NotImplementedError(f"mode `{mode}' not implemented for zst")
+            raise ValueError("mode must be 'r', 'w' or 'x'")
         openobj: str | typing.BinaryIO = name if fileobj is None else fileobj
         try:
             import zstandard