diff --git a/pangaea/decoders/upernet.py b/pangaea/decoders/upernet.py
index 516a68d..3aa0383 100644
--- a/pangaea/decoders/upernet.py
+++ b/pangaea/decoders/upernet.py
@@ -1,3 +1,5 @@
+# Adapted from https://github.com/open-mmlab/mmsegmentation/blob/main/mmseg/models/decode_heads/uper_head.py
+
 import torch
 import torch.nn as nn
 import torch.nn.functional as F