diff --git a/README.md b/README.md
index e8562c15fb03c3f3c054f95b8833bd6382749b38..73f49fe9503138ea18224c5d5532be0fc1eaf3d2 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@ Artificial Neural Network
 Règles de la chaine pour le calcul du gradient :
 
 
-2. ∂C/∂A(2) = 2/Nout * (A(2) - Y)
+2. ∂C/∂A(2) = 2 * (A(2) - Y) / Nout
 
 3. ∂C/∂Z(2) = ∂C/∂A(2) * ∂A(2)/∂Z(2)  
    ∂C/∂Z(2) = ∂C/∂A(2) * σ'(Z(2))