diff --git a/src/textual/css/stylesheet.py b/src/textual/css/stylesheet.py
index 10d3a22cc..e92a87579 100644
--- a/src/textual/css/stylesheet.py
+++ b/src/textual/css/stylesheet.py
@@ -408,6 +408,7 @@ class Stylesheet:
 
         component_classes = node._get_component_classes()
         if component_classes:
+            # Create virtual nodes that exist to extract styles
             refresh_node = False
             old_component_styles = node._component_styles.copy()
             node._component_styles.clear()
@@ -419,6 +420,7 @@ class Stylesheet:
                     not refresh_node
                     and old_component_styles.get(component) != virtual_node.styles
                 ):
+                    # If the styles have changed we want to refresh the node
                     refresh_node = True
                 node._component_styles[component] = virtual_node.styles
             if refresh_node:
diff --git a/tests/snapshot_tests/test_snapshots.py b/tests/snapshot_tests/test_snapshots.py
index 83253aa85..05d48a5fe 100644
--- a/tests/snapshot_tests/test_snapshots.py
+++ b/tests/snapshot_tests/test_snapshots.py
@@ -213,7 +213,7 @@ def test_demo(snap_compare):
     """Test the demo app (python -m textual)"""
     assert snap_compare(
         Path("../../src/textual/demo.py"),
-        press=["down", "down", "down", "_"],
+        press=["down", "down", "down"],
         terminal_size=(100, 30),
     )
 
@@ -238,6 +238,4 @@ def test_disabled_widgets(snap_compare):
 
 
 def test_focus_component_class(snap_compare):
-    assert snap_compare(
-        SNAPSHOT_APPS_DIR / "focus_component_class.py", press=["tab", "_"]
-    )
+    assert snap_compare(SNAPSHOT_APPS_DIR / "focus_component_class.py", press=["tab"])