diff --git a/my_flask_app/commands.py b/my_flask_app/commands.py
index 6c21d07..1182904 100644
--- a/my_flask_app/commands.py
+++ b/my_flask_app/commands.py
@@ -19,14 +19,22 @@
     is_flag=True,
     help="Show coverage report",
 )
-def test(coverage):
+@click.option(
+    "-k",
+    "--filter",
+    default=None,
+    help="Filter tests by keyword expressions",
+)
+def test(coverage, filter):
     """Run the tests."""
     import pytest
 
     args = [TEST_PATH, "--verbose"]
     if coverage:
         args.append("--cov=my_flask_app")
-    rv = pytest.main(args)
+    if filter:
+        args.extend(["-k", filter])
+    rv = pytest.main(args=args)
     exit(rv)