diff --git a/torch_uncertainty/datasets/classification/cub.py b/torch_uncertainty/datasets/classification/cub.py
index 69606a49..0924b40e 100644
--- a/torch_uncertainty/datasets/classification/cub.py
+++ b/torch_uncertainty/datasets/classification/cub.py
@@ -38,7 +38,8 @@ def __init__(
                 returns them instead of the images. Defaults to False.
             download (bool, optional): If True, downloads the dataset from the internet and puts it
                 in root directory. If dataset is already downloaded, it is not downloaded again.
-                Defaults to
+                Defaults to False.
+
         Reference:
             Wah, C. and Branson, S. and Welinder, P. and Perona, P. and Belongie, S. Caltech-UCSD
                 Birds 200.
@@ -56,10 +57,9 @@ def __init__(
         super().__init__(Path(root) / "CUB_200_2011" / "images", transform, target_transform)
 
         training_idx = self._load_train_idx()
+        self.attributes, self.certainties = self._load_attributes()
         if load_attributes:
-            self.samples = zip(
-                self._load_attributes(), [sam[1] for sam in self.samples], strict=False
-            )
+            self.samples = zip(self.attributes, [sam[1] for sam in self.samples], strict=False)
             self.attribute_names = self._load_attribute_names()
             self.loader = torch.nn.Identity()
 
@@ -69,31 +69,56 @@ def __init__(
         self.classnames = self._load_classnames()
 
     def _load_classnames(self) -> list[str]:
+        """Load the classnames of the dataset.
+
+        Returns:
+            list[str]: the list containing the names of the 200 classes.
+        """
         with Path(self.folder_root / "CUB_200_2011" / "classes.txt").open("r") as f:
             return [
                 line.split(" ")[1].split(".")[1].replace("\n", "").replace("_", " ") for line in f
             ]
 
     def _load_train_idx(self) -> Tensor:
+        """Load the index of the training data to make the split.
+
+        Returns:
+            Tensor: whether the images belong to the training or test split.
+        """
         with (self.folder_root / "CUB_200_2011" / "train_test_split.txt").open("r") as f:
             return torch.as_tensor([int(line.split(" ")[1]) for line in f])
 
-    def _load_attributes(self) -> Tensor:
-        attributes = []
+    def _load_attributes(self) -> tuple[Tensor, Tensor]:
+        """Load the attributes associated to each image.
+
+        Returns:
+            tuple[Tensor, Tensor]: The presence of the 312 attributes along with their certainty.
+        """
+        attributes, certainty = [], []
         with (self.folder_root / "CUB_200_2011" / "attributes" / "image_attribute_labels.txt").open(
             "r"
         ) as f:
-            attributes = [
-                0.5 + 2 * (int(line.split(" ")[2]) - 0.5) * (int(line.split(" ")[3]) - 1) * 1 / 6
-                for line in f
-            ]
-        return rearrange(torch.as_tensor(attributes), "(n c) -> n c", c=312)
+            attributes = [int(line.split(" ")[2]) for line in f]
+            certainty = [(int(line.split(" ")[3]) - 1) / 3 for line in f]
+        return rearrange(torch.as_tensor(attributes), "(n c) -> n c", c=312), rearrange(
+            torch.as_tensor(certainty), "(n c) -> n c", c=312
+        )
 
     def _load_attribute_names(self) -> list[str]:
+        """Load the names of the attributes.
+
+        Returns:
+            list[str]: The list of the names of the 312 attributes.
+        """
         with (self.folder_root / "attributes.txt").open("r") as f:
             return [line.split(" ")[1].replace("\n", "").replace("_", " ") for line in f]
 
     def _check_integrity(self) -> bool:
+        """Check the integrity of the dataset.
+
+        Returns:
+            bool: True when the md5 of the archive corresponds.
+        """
         fpath = self.folder_root / self.filename
         return check_integrity(
             fpath,
@@ -101,6 +126,7 @@ def _check_integrity(self) -> bool:
         )
 
     def _download(self):
+        """Download the dataset from caltec.edu."""
         if self._check_integrity():
             logging.info("Files already downloaded and verified")
             return