diff --git a/pymath/calculus/abstract_polynom.py b/pymath/calculus/abstract_polynom.py
index b6a1ac0..a762522 100644
--- a/pymath/calculus/abstract_polynom.py
+++ b/pymath/calculus/abstract_polynom.py
@@ -327,6 +327,16 @@ class AbstractPolynom(Explicable):
         6 x^{  2 } + 12 x + 3
         >>> Q.steps
         [< Step [6, 'x', 2, ^, *, 3, 'x', *, +, 4, 'x', *, +, 5, 'x', *, +, 1, +, 2, +]>, < Step [6, 'x', 2, ^, *, 3, 4, +, 5, +, 'x', *, +, 1, 2, +, +]>, < Step [6, 'x', 2, ^, *, 7, 5, +, 'x', *, +, 3, +]>, < Step [6, 'x', 2, ^, *, 12, 'x', *, +, 3, +]>]
+        >>> P = AbstractPolynom([[1,2], [3,4,5], 6], 'y')
+        >>> Q = P.reduce()
+        >>> Q
+        < AbstractPolynom y [3, 12, 6]>
+        >>> for i in Q.explain():
+        ...     print(i)
+        6 y^{  2 } + 3 y + 4 y + 5 y + 1 + 2
+        6 y^{  2 } + ( 3 + 4 + 5 ) y + 1 + 2
+        6 y^{  2 } + ( 7 + 5 ) y + 3
+        6 y^{  2 } + 12 y + 3
         >>> P = AbstractPolynom([1,2])
         >>> Q = AbstractPolynom([P,3], 'y')
         >>> Q
@@ -345,10 +355,6 @@ class AbstractPolynom(Explicable):
         3 y + 2 x + 1 + 1
         3 y + 2 x + 2
         """
-
-        # TODO: Il manque le ini_step |jeu. mars 10 12:39:40 EAT 2016
-
-        # gather steps for every coefficients
         smpl_coef = []
         for coef in self._coef:
 
@@ -367,7 +373,7 @@ class AbstractPolynom(Explicable):
 
         ini_step = [Step(self)]
         for s in Explicable.merge_history(smpl_coef):
-            ini_step.append(Step(AbstractPolynom(s)))
+            ini_step.append(Step(AbstractPolynom(s, self._letter)))
 
         ans.this_append_before(
                 ini_step
@@ -398,7 +404,6 @@ class AbstractPolynom(Explicable):
         7
         >>> c.steps
         [< Step [2, 2, *, 3, +]>, < Step [4, 3, +]>, < Step [4, 3, +]>, < Step [7]>]
-
         """
         # Simplify each element before adding them
         smpl_elem = []