diff --git a/pyproject.toml b/pyproject.toml
index c7ae71c2..b5ffafb6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,6 +38,7 @@ dev = [
 markers = [
     "integration: marks tests as integration tests (requires live GUI)",
     "clean_install: clean install verification (opt-in via RUN_CLEAN_INSTALL_TEST=1)",
+    "docker: docker build and run test (opt-in via RUN_DOCKER_TEST=1)",
 ]
 
 [tool.mypy]