diff --git a/main.py b/main.py
index 7695605..4730763 100644
--- a/main.py
+++ b/main.py
@@ -664,6 +664,7 @@ class UpdateOptodesWindow(QWidget):
 
         elif extension == '.xlsx':
 
+            # TODO: Bad! Why assume sheet1 has the contents?
             df = pd.read_excel(file_b, sheet_name='Sheet1')
 
             def _get_block_data(df, block_id, row_mapping, scale=0.001):