diff --git a/python/tests/conftest.py b/python/tests/conftest.py
index 6145c66d5..a0504c499 100644
--- a/python/tests/conftest.py
+++ b/python/tests/conftest.py
@@ -11,11 +11,11 @@ def pytest_addoption(parser):
 
 @pytest.fixture
 def update(request):
-    """store current results as new reference results."""
+    """Store current results as new reference results."""
     return request.config.getoption("--update")
 
 @pytest.fixture
 def reference_dir_base():
-    """directory containing reference results."""
+    """Directory containing reference results."""
     env = damask.Environment()
     return os.path.join(env.rootDir(),'python','tests','reference')
diff --git a/python/tests/test_DADF5.py b/python/tests/test_DADF5.py
index 5e86272bd..5a6478f03 100644
--- a/python/tests/test_DADF5.py
+++ b/python/tests/test_DADF5.py
@@ -18,7 +18,7 @@ def default(tmp_path,reference_dir):
 
 @pytest.fixture
 def reference_dir(reference_dir_base):
-    """directory containing reference results."""
+    """Directory containing reference results."""
     return os.path.join(reference_dir_base,'DADF5')
 
 
diff --git a/python/tests/test_Geom.py b/python/tests/test_Geom.py
index 69492136d..bc3a3e751 100644
--- a/python/tests/test_Geom.py
+++ b/python/tests/test_Geom.py
@@ -23,7 +23,7 @@ def default():
 
 @pytest.fixture
 def reference_dir(reference_dir_base):
-    """directory containing reference results."""
+    """Directory containing reference results."""
     return os.path.join(reference_dir_base,'Geom')