diff --git a/LinearReg/01-Linear-Regression.ipynb b/LinearReg/01-Linear-Regression.ipynb
index 77780c5013d1b1da1c89df471d3989010111692f..f8c2941ffa9dc6e367e5f579e39f72daed759442 100644
--- a/LinearReg/01-Linear-Regression.ipynb
+++ b/LinearReg/01-Linear-Regression.ipynb
@@ -124,7 +124,7 @@
     "\n",
     "With the simplified variant : $$MSE(X,h_\\theta)=\\frac1n\\sum_{i=1}^n\\left[h_\\theta(X^{(i)})-Y^{(i)}\\right]^2$$\n",
     "\n",
-    "The optimal value of regression is : $$\\hat{ \\theta } =( X^{-T} .X)^{-1}.X^{-T}.Y$$\n",
+    "The optimal value of regression is : $$\\hat{ \\theta } =( X^{T} .X)^{-1}.X^{T}.Y$$\n",
     "\n",
     "Démontstration : https://eli.thegreenplace.net/2014/derivation-of-the-normal-equation-for-linear-regression"
    ]