diff --git a/api/operation.py b/api/operation.py
index 335fee1..50fca6a 100644
--- a/api/operation.py
+++ b/api/operation.py
@@ -177,10 +177,10 @@ def pick_snapshot(name: str, tag: str) -> None:
                 cur.execute(f"update operation set redo_child = '{target}' where id = '{target_parents[1]}'")
                 execute_redo(name)
 
-# transaction is volatile, commit/rollback will destroy transaction.
-# can not redo a rollback transaction.
+# transaction is volatile, commit/abort will destroy transaction.
+# can not redo an aborted transaction.
 # but can undo a committed transaction... inconsistent...
-# it may remove snapshot tag if snapshot in a rollback transaction
+# it may remove snapshot if it is in aborted transaction
 
 def have_transaction(name: str) -> bool:
     with conn[name].cursor(row_factory=dict_row) as cur:
@@ -189,7 +189,7 @@ def have_transaction(name: str) -> bool:
 
 def start_transaction(name: str, strict: bool = False) -> None:
     if have_transaction(name):
-        print("Only support single transaction now, please commit/rollback current transaction!")
+        print("Only support single transaction now, please commit/abort current transaction!")
         return
 
     curr = _get_current_operation(name)