diff --git a/mbcp/mp_math/equation.py b/mbcp/mp_math/equation.py
index 63fda40..869f9bc 100644
--- a/mbcp/mp_math/equation.py
+++ b/mbcp/mp_math/equation.py
@@ -63,14 +63,7 @@ def get_partial_derivative_func(func: MultiVarsFunc, var: int | tuple[int, ...],
     # 内部函数不注释，以防止生成文档
     if isinstance(var, int):
         def partial_derivative_func(*args: Var) -> Var:
-            """
-            @litedoc-hide
-            Args:
-                *args:
-
-            Returns:
-
-            """
+            """@litedoc-hide"""
             args_list_plus = list(args)
             args_list_plus[var] += epsilon
             args_list_minus = list(args)