diff --git a/data/Argoverse.yaml b/data/Argoverse.yaml
index 312791b33a2d..43426f5ebe15 100644
--- a/data/Argoverse.yaml
+++ b/data/Argoverse.yaml
@@ -4,7 +4,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── Argoverse  ← downloads here
+#     └── Argoverse  ← downloads here (31.3 GB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
diff --git a/data/GlobalWheat2020.yaml b/data/GlobalWheat2020.yaml
index c1ba289f2833..4c43693f1d82 100644
--- a/data/GlobalWheat2020.yaml
+++ b/data/GlobalWheat2020.yaml
@@ -4,7 +4,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── GlobalWheat2020  ← downloads here
+#     └── GlobalWheat2020  ← downloads here (7.0 GB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
diff --git a/data/Objects365.yaml b/data/Objects365.yaml
index bd6e5d6e1144..1e09fd718479 100644
--- a/data/Objects365.yaml
+++ b/data/Objects365.yaml
@@ -4,7 +4,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── Objects365  ← downloads here
+#     └── Objects365  ← downloads here (750 GB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
diff --git a/data/SKU-110K.yaml b/data/SKU-110K.yaml
index 46459eab6bb7..2acf34d155bd 100644
--- a/data/SKU-110K.yaml
+++ b/data/SKU-110K.yaml
@@ -4,7 +4,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── SKU-110K  ← downloads here
+#     └── SKU-110K  ← downloads here (13.6 GB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
diff --git a/data/VOC.yaml b/data/VOC.yaml
index 9865967dd028..4fec304133be 100644
--- a/data/VOC.yaml
+++ b/data/VOC.yaml
@@ -4,7 +4,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── VOC  ← downloads here
+#     └── VOC  ← downloads here (2.8 GB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
diff --git a/data/VisDrone.yaml b/data/VisDrone.yaml
index 2a3b2f03e674..fe87588ee870 100644
--- a/data/VisDrone.yaml
+++ b/data/VisDrone.yaml
@@ -4,7 +4,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── VisDrone  ← downloads here
+#     └── VisDrone  ← downloads here (2.3 GB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
diff --git a/data/coco.yaml b/data/coco.yaml
index 7494fc2f9cd1..0c0c4adab05d 100644
--- a/data/coco.yaml
+++ b/data/coco.yaml
@@ -4,7 +4,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── coco  ← downloads here
+#     └── coco  ← downloads here (20.1 GB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
diff --git a/data/coco128.yaml b/data/coco128.yaml
index d07c704407a1..2517d2079257 100644
--- a/data/coco128.yaml
+++ b/data/coco128.yaml
@@ -4,7 +4,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── coco128  ← downloads here
+#     └── coco128  ← downloads here (7 MB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]
diff --git a/data/xView.yaml b/data/xView.yaml
index fd82828dcb8c..3b38f1ff4439 100644
--- a/data/xView.yaml
+++ b/data/xView.yaml
@@ -5,7 +5,7 @@
 # parent
 # ├── yolov5
 # └── datasets
-#     └── xView  ← downloads here
+#     └── xView  ← downloads here (20.7 GB)
 
 
 # Train/val/test sets as 1) dir: path/to/imgs, 2) file: path/to/imgs.txt, or 3) list: [path/to/imgs1, path/to/imgs2, ..]