diff --git a/autotest/pytest.ini b/autotest/pytest.ini
index 1bfeebe755b..a58a609e769 100644
--- a/autotest/pytest.ini
+++ b/autotest/pytest.ini
@@ -5,6 +5,7 @@ python_files =
 markers =
     slow: tests taking more than a few seconds to complete
     repo: tests using models loaded from an external repository
+    large: tests using large models (examples and largetestmodels)
     regression: comparing results from different versions
     developmode: tests that should only run with IDEVELOPMODE = 1
     gwf: tests for groundwater flow models