diff --git a/test_runner/performance/README.md b/test_runner/performance/README.md
index d113e9e637..7ad65821d4 100644
--- a/test_runner/performance/README.md
+++ b/test_runner/performance/README.md
@@ -14,7 +14,7 @@ Some handy pytest flags for local development:
 - `-s` shows test output
 - `-k` selects a test to run
 - `--timeout=0` disables our default timeout of 300s (see `setup.cfg`)
-- `--cleanup-test-ouput` cleans up after each test
+- `--preserve-database-files` to skip cleanup
 
 # What performance tests do we have and how we run them