diff --git a/api/operation.py b/api/operation.py
index cedb82c..335fee1 100644
--- a/api/operation.py
+++ b/api/operation.py
@@ -16,7 +16,7 @@ def _remove_transaction(name: str) -> None:
 
 def _remove_operation(name: str, id: int) -> None:
     with conn[name].cursor(row_factory=dict_row) as cur:
-        # can not be >= since there is a tree !
+        # can not be >= to cascade delete since there is a tree !
         cur.execute(f"delete from transaction_operation where id = {id}") # this should not happen
         cur.execute(f"delete from snapshot_operation where id = {id}") # this may happen
         cur.execute(f"delete from operation where id = {id}")