diff --git a/adetailer/__version__.py b/adetailer/__version__.py
index 869aead..9d86149 100644
--- a/adetailer/__version__.py
+++ b/adetailer/__version__.py
@@ -1 +1 @@
-__version__ = "24.1.2"
+__version__ = "24.3.0.dev0"
diff --git a/adetailer/args.py b/adetailer/args.py
index b0f311e..bda899d 100644
--- a/adetailer/args.py
+++ b/adetailer/args.py
@@ -42,6 +42,7 @@ class ArgsList(UserList):
 
 class ADetailerArgs(BaseModel, extra=Extra.forbid):
     ad_model: str = "None"
+    ad_model_classes: str = ""
     ad_prompt: str = ""
     ad_negative_prompt: str = ""
     ad_confidence: confloat(ge=0.0, le=1.0) = 0.3
@@ -111,6 +112,7 @@ class ADetailerArgs(BaseModel, extra=Extra.forbid):
         p = {name: getattr(self, attr) for attr, name in ALL_ARGS}
         ppop = partial(self.ppop, p)
 
+        ppop("ADetailer model classes")
         ppop("ADetailer prompt")
         ppop("ADetailer negative prompt")
         ppop("ADetailer mask only top k largest", cond=0)
@@ -183,6 +185,7 @@ class ADetailerArgs(BaseModel, extra=Extra.forbid):
 
 _all_args = [
     ("ad_model", "ADetailer model"),
+    ("ad_model_classes", "ADetailer model classes"),
     ("ad_prompt", "ADetailer prompt"),
     ("ad_negative_prompt", "ADetailer negative prompt"),
     ("ad_confidence", "ADetailer confidence"),
diff --git a/adetailer/common.py b/adetailer/common.py
index 7d0460d..5a8b1ab 100644
--- a/adetailer/common.py
+++ b/adetailer/common.py
@@ -60,6 +60,7 @@ def get_models(
         )
     models.update(
         {
+            "yolov8x-world.pt": "yolov8x-world.pt",
             "mediapipe_face_full": None,
             "mediapipe_face_short": None,
             "mediapipe_face_mesh": None,
diff --git a/adetailer/ui.py b/adetailer/ui.py
index a044a53..cfd665d 100644
--- a/adetailer/ui.py
+++ b/adetailer/ui.py
@@ -85,6 +85,14 @@ def on_generate_click(state: dict, *values: Any):
     return state
 
 
+def on_ad_model_update(model: str):
+    if "-world" in model:
+        return gr.update(
+            visible=True, placeholder="Comma separated class names to detect."
+        )
+    return gr.update(visible=False, placeholder="")
+
+
 def on_cn_model_update(cn_model_name: str):
     cn_model_name = cn_model_name.replace("inpaint_depth", "depth")
     for t in cn_module_choices:
@@ -177,6 +185,20 @@ def one_ui_group(n: int, is_img2img: bool, webui_info: WebuiInfo):
             elem_id=eid("ad_model"),
         )
 
+        w.ad_model_classes = gr.Textbox(
+            label="ADetailer model classes" + suffix(n),
+            value="",
+            visible=False,
+            elem_id=eid("ad_classes"),
+        )
+
+        w.ad_model_classes.change(
+            on_ad_model_update,
+            inputs=w.ad_model,
+            outputs=w.ad_model_classes,
+            queue=False,
+        )
+
     with gr.Group():
         with gr.Row(elem_id=eid("ad_toprow_prompt")):
             w.ad_prompt = gr.Textbox(
diff --git a/adetailer/ultralytics.py b/adetailer/ultralytics.py
index 8483b12..de19ff7 100644
--- a/adetailer/ultralytics.py
+++ b/adetailer/ultralytics.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from pathlib import Path
+from typing import TYPE_CHECKING
 
 import cv2
 from PIL import Image
@@ -9,6 +10,10 @@ from torchvision.transforms.functional import to_pil_image
 from adetailer import PredictOutput
 from adetailer.common import create_mask_from_bbox
 
+if TYPE_CHECKING:
+    import torch
+    from ultralytics import YOLO, YOLOWorld
+
 
 def ultralytics_predict(
     model_path: str | Path,
@@ -39,14 +44,14 @@ def ultralytics_predict(
     return PredictOutput(bboxes=bboxes, masks=masks, preview=preview)
 
 
-def apply_classes(model, model_path: str | Path, classes: str):
+def apply_classes(model: YOLO | YOLOWorld, model_path: str | Path, classes: str):
     if not classes or "-world" not in Path(model_path).stem:
         return
     parsed = [c.strip() for c in classes.split(",")]
     model.set_classes(parsed)
 
 
-def mask_to_pil(masks, shape: tuple[int, int]) -> list[Image.Image]:
+def mask_to_pil(masks: torch.Tensor, shape: tuple[int, int]) -> list[Image.Image]:
     """
     Parameters
     ----------
@@ -54,7 +59,7 @@ def mask_to_pil(masks, shape: tuple[int, int]) -> list[Image.Image]:
         The device can be CUDA, but `to_pil_image` takes care of that.
 
     shape: tuple[int, int]
-        (width, height) of the original image
+        (W, H) of the original image
     """
     n = masks.shape[0]
     return [to_pil_image(masks[i], mode="L").resize(shape) for i in range(n)]
diff --git a/scripts/!adetailer.py b/scripts/!adetailer.py
index 747798c..8fa8352 100644
--- a/scripts/!adetailer.py
+++ b/scripts/!adetailer.py
@@ -695,6 +695,7 @@ class AfterDetailerScript(scripts.Script):
             predictor = ultralytics_predict
             ad_model = self.get_ad_model(args.ad_model)
             kwargs["device"] = self.ultralytics_device
+            kwargs["classes"] = args.ad_model_classes
 
         with change_torch_load():
             pred = predictor(ad_model, pp.image, args.ad_confidence, **kwargs)
diff --git a/tests/test_ultralytics.py b/tests/test_ultralytics.py
index ad855ad..f3885de 100644
--- a/tests/test_ultralytics.py
+++ b/tests/test_ultralytics.py
@@ -28,7 +28,7 @@ def test_ultralytics_hf_models(sample_image: Image.Image, model_name: str):
 
 
 def test_yolo_world_default(sample_image: Image.Image):
-    result = ultralytics_predict("yolov8l-world.pt", sample_image)
+    result = ultralytics_predict("yolov8x-world.pt", sample_image)
     assert result.preview is not None
 
 
@@ -44,5 +44,5 @@ def test_yolo_world_default(sample_image: Image.Image):
     ],
 )
 def test_yolo_world(sample_image2: Image.Image, klass: str):
-    result = ultralytics_predict("yolov8l-world.pt", sample_image2, classes=klass)
+    result = ultralytics_predict("yolov8x-world.pt", sample_image2, classes=klass)
     assert result.preview is not None