diff --git a/pymath/calculus/explicable.py b/pymath/calculus/explicable.py
index 1c87b1c..03e939f 100644
--- a/pymath/calculus/explicable.py
+++ b/pymath/calculus/explicable.py
@@ -91,9 +91,7 @@ class Explicable(Renderable):
 
     @staticmethod
     def merge_history(expl1, expl2, operation):
-        """ Take two Explicable objects, explain where they are from and merge their history
-
-        /!\ Using this method make the two objects amnesiac
+        r""" Take two Explicable objects, explain where they are from and merge their history
 
         :param expl1: fist explicable
         :param expl2: second explicable