diff --git a/homeworks/assignment03_derivatives/derivatives.py b/homeworks/assignment03_derivatives/derivatives.py
index 8bc00287d..0df2ecd2a 100644
--- a/homeworks/assignment03_derivatives/derivatives.py
+++ b/homeworks/assignment03_derivatives/derivatives.py
@@ -124,7 +124,6 @@ def l2_reg_derivative(w):
     @staticmethod
     def l1_reg_derivative(w):
         """
-        Y : numpy array of shape (`n_observations`, `target_dimentionality`) or (`n_observations`,)
         w : numpy array of shape (`n_features`, `target_dimentionality`) or (`n_features`,)
 
         Return : numpy array of same shape as `w`
diff --git a/homeworks/assignment03_derivatives/derivatives_assignment_03.ipynb b/homeworks/assignment03_derivatives/derivatives_assignment_03.ipynb
index cc44591cc..b3e1e121f 100644
--- a/homeworks/assignment03_derivatives/derivatives_assignment_03.ipynb
+++ b/homeworks/assignment03_derivatives/derivatives_assignment_03.ipynb
@@ -225,7 +225,6 @@
     "    @staticmethod\n",
     "    def l1_reg_derivative(w):\n",
     "        \"\"\"\n",
-    "        Y : numpy array of shape (`n_observations`, `target_dimentionality`) or (`n_observations`,)\n",
     "        w : numpy array of shape (`n_features`, `target_dimentionality`) or (`n_features`,)\n",
     "\n",
     "        Return : numpy array of same shape as `w`\n",