diff --git a/python/fate_arch/abc/_computing.py b/python/fate_arch/abc/_computing.py
index f6dba358cc..7131ae964a 100644
--- a/python/fate_arch/abc/_computing.py
+++ b/python/fate_arch/abc/_computing.py
@@ -84,6 +84,7 @@ def collect(self, **kwargs) -> typing.Generator:
     def take(self, n=1, **kwargs):
         """
         take ``n`` data from table
+
         Parameters
         ----------
         n: int
@@ -93,6 +94,10 @@ def take(self, n=1, **kwargs):
         -------
         list
            a list of ``n`` data
+
+        Notes
+        ------
+        no order guarantee
         """
         ...
 
@@ -105,6 +110,10 @@ def first(self, **kwargs):
         -------
         object
           a data from table
+
+        Notes
+        ------
+        no order guarantee
         """
         ...
 
@@ -275,6 +284,7 @@ def applyPartitions(self, func):
     def flatMap(self, func):
         """
         apply a flat ``func`` to each data of table
+
         Parameters
         ----------
         func: ``typing.Callable[[object, object], typing.List[object, object]]``
@@ -381,6 +391,7 @@ def sample(self, *, fraction: typing.Optional[float] = None, num: typing.Optiona
     def filter(self, func):
         """
         returns a new table containing only those keys which satisfy a predicate passed in via ``func``.
+
         Parameters
         ----------
         func: typing.Callable[[object, object], bool]