diff --git a/src/textual/layout.py b/src/textual/layout.py
index a8e759558..4c900a593 100644
--- a/src/textual/layout.py
+++ b/src/textual/layout.py
@@ -2,6 +2,8 @@ from .widget import Widget
 
 
 class Vertical(Widget):
+    """A container widget to align children vertically."""
+
     CSS = """
     Vertical {
         layout: vertical;       
@@ -10,6 +12,8 @@ class Vertical(Widget):
 
 
 class Horizontal(Widget):
+    """A container widget to align children horizontally."""
+
     CSS = """
     Horizontal {
         layout: horizontal;