diff --git a/IntroductionToNumpy/task01 数据类型及数组创建/04. 数组的创建.ipynb b/IntroductionToNumpy/task01 数据类型及数组创建/04. 数组的创建.ipynb
index 5235bd5..226d8c7 100644
--- a/IntroductionToNumpy/task01 数据类型及数组创建/04. 数组的创建.ipynb	
+++ b/IntroductionToNumpy/task01 数据类型及数组创建/04. 数组的创建.ipynb	
@@ -101,7 +101,7 @@
     "x = np.array([[1, 1, 1], [1, 1, 1], [1, 1, 1]])\n",
     "y = np.array(x)\n",
     "z = np.asarray(x)\n",
-    "w = np.asarray(x, dtype=np.int)\n",
+    "w = np.asarray(x, dtype=np.float64)\n",
     "x[1][2] = 2\n",
     "print(x,type(x),x.dtype)\n",
     "# [[1 1 1]\n",
@@ -119,9 +119,9 @@
     "#  [1 1 1]] <class 'numpy.ndarray'> int32\n",
     "\n",
     "print(w,type(w),w.dtype)\n",
-    "# [[1 1 1]\n",
-    "#  [1 1 2]\n",
-    "#  [1 1 1]] <class 'numpy.ndarray'> int32\n",
+    "# [[1. 1. 1.]\n",
+    "#  [1. 1. 1.]\n",
+    "#  [1. 1. 1.]] <class 'numpy.ndarray'> float64\n",
     "```\n",
     "\n",
     "\n",
@@ -311,6 +311,7 @@
     "- `diag()`函数：提取对角线或构造对角数组。\n",
     "\n",
     "```python\n",
+    "\\ k : int, optional 对角线的位置，大于零位于对角线上面，小于零则在下面。"
     "def diag(v, k=0):\n",
     "```\n",
     "\n",
@@ -325,6 +326,7 @@
     "#  [6 7 8]]\n",
     "print(np.diag(x))  # [0 4 8]\n",
     "print(np.diag(x, k=1))  # [1 5]\n",
+    "print(np.diag(x, k=2))  # [2]\n",
     "print(np.diag(x, k=-1))  # [3 7]\n",
     "\n",
     "v = [1, 3, 5, 7]\n",