diff --git a/pytest.ini b/pytest.ini
index 3538267..3fa89f0 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -4,6 +4,7 @@ python_files = test_*.py
 python_functions = test_*
 markers =
     integration: optional tests (live network, subprocess Reticulum, etc.)
+    long_running: multi-minute soak tests (set MESHCHAT_LONG_TEST_SECONDS; see test_long_running_stress.py)
 asyncio_mode = auto
 asyncio_default_fixture_loop_scope = function
 filterwarnings =