diff --git a/docs/examples/extracting_tables.md b/docs/examples/extracting_tables.md
index 8fd29a5..d668473 100644
--- a/docs/examples/extracting_tables.md
+++ b/docs/examples/extracting_tables.md
@@ -30,7 +30,7 @@ def md_to_df(data: Any) -> Any:
     return data
 
 MarkdownDataFrame = Annotated[
-    InstanceOf(pd.DataFrame),
+    InstanceOf[pd.DataFrame],
     BeforeValidator(md_to_df),
     PlainSerializer(lambda df: df.to_markdown()),
     WithJsonSchema(