diff --git a/src/textual/_compositor.py b/src/textual/_compositor.py
index 7461fd5f2..7aa0fe7ee 100644
--- a/src/textual/_compositor.py
+++ b/src/textual/_compositor.py
@@ -100,11 +100,11 @@ class ChopsUpdate:
     def __init__(
         self, chops: list[dict[int, list[Segment] | None]], crop: Region
     ) -> None:
-        """Apply spans, which consist of a tuple of (LINE, OFFSET, SEGMENTS)
+        """A renderable which updates chops (fragments of lines).
 
         Args:
-            spans (list[tuple[int, int, list[Segment]]]): A list of spans.
-            crop_y (int): The y extent of the crop region
+            chops (list[dict[int, list[Segment]  |  None]]): A mapping of offsets to list of segments, per line.
+            crop (Region): Region to restrict update to.
         """
         self.chops = chops
         self.crop = crop
diff --git a/tests/test_cache.py b/tests/test_cache.py
index 305060ae4..e81b7e06a 100644
--- a/tests/test_cache.py
+++ b/tests/test_cache.py
@@ -1,3 +1,4 @@
+from __future__ import annotations
 from __future__ import unicode_literals
 
 import pytest