diff --git a/deepmd/descriptor/loc_frame.py b/deepmd/descriptor/loc_frame.py
index 6240349c2f..4aedf8b247 100644
--- a/deepmd/descriptor/loc_frame.py
+++ b/deepmd/descriptor/loc_frame.py
@@ -33,9 +33,9 @@ class DescrptLocFrame (Descriptor) :
             - axis_rule[i*6+0]: class of the atom defining the first axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.\n\n\
             - axis_rule[i*6+1]: type of the atom defining the first axis of type-i atom.\n\n\
             - axis_rule[i*6+2]: index of the axis atom defining the first axis. Note that the neighbors with the same class and type are sorted according to their relative distance.\n\n\
-            - axis_rule[i*6+3]: class of the atom defining the first axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.\n\n\
+            - axis_rule[i*6+3]: class of the atom defining the second axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.\n\n\
             - axis_rule[i*6+4]: type of the atom defining the second axis of type-i atom.\n\n\
-            - axis_rule[i*6+5]: class of the atom defining the second axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.    
+            - axis_rule[i*6+5]: index of the axis atom defining the second axis. Note that the neighbors with the same class and type are sorted according to their relative distance.
     """
     def __init__(self, 
                  rcut: float,
diff --git a/deepmd/utils/argcheck.py b/deepmd/utils/argcheck.py
index 49cf21de5b..daf4d644a8 100644
--- a/deepmd/utils/argcheck.py
+++ b/deepmd/utils/argcheck.py
@@ -107,9 +107,9 @@ def descrpt_local_frame_args ():
 - axis_rule[i*6+0]: class of the atom defining the first axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.\n\n\
 - axis_rule[i*6+1]: type of the atom defining the first axis of type-i atom.\n\n\
 - axis_rule[i*6+2]: index of the axis atom defining the first axis. Note that the neighbors with the same class and type are sorted according to their relative distance.\n\n\
-- axis_rule[i*6+3]: class of the atom defining the first axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.\n\n\
+- axis_rule[i*6+3]: class of the atom defining the second axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.\n\n\
 - axis_rule[i*6+4]: type of the atom defining the second axis of type-i atom.\n\n\
-- axis_rule[i*6+5]: class of the atom defining the second axis of type-i atom. 0 for neighbors with full coordinates and 1 for neighbors only with relative distance.'
+- axis_rule[i*6+5]: index of the axis atom defining the second axis. Note that the neighbors with the same class and type are sorted according to their relative distance.'
     
     return [
         Argument("sel_a", list, optional = False, doc = doc_sel_a),