diff --git a/README.md b/README.md
index 4a2294c..bc9c014 100644
--- a/README.md
+++ b/README.md
@@ -92,7 +92,7 @@ annotation.export_thumb_masks("xxx/masks")
 import wsiprocess as wp
 import cv2
 slide = wp.slide("xxx.tiff")
-annotation = wp.annotation("yyy.tiff", is_image=True)
+annotation = wp.annotation("", is_image=True)
 target_classes = ["benign", "malignant"]
 annotation.add_class(target_classes)
 benign_mask = cv2.imread("benign_mask.png", 0) * 255
@@ -101,7 +101,7 @@ malignant_mask = cv2.imread("malignant_mask.png", 0) * 255
 annotation.from_image(benign_mask, "benign")
 annotation.from_image(malignant_mask, "malignant")
 rule = wp.rule("xxx.json")
-patcher = wp.patcher(slide, "classification", foreground=True)
+patcher = wp.patcher(slide, "classification", annotation=annotation)
 patcher.get_patch_parallel(target_classes)
 ```