diff --git a/04 - Working with NumPy arrays.ipynb b/04 - Working with NumPy arrays.ipynb
index de4f2c0342474e16b8a4fdc90b44b518f747ca59..a5d462bf679ea1b6caa601608a83856bab3412b9 100644
--- a/04 - Working with NumPy arrays.ipynb	
+++ b/04 - Working with NumPy arrays.ipynb	
@@ -757,7 +757,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Explicitely specifying the data type\n",
+      "Explicitly specifying the data type\n",
       "---"
      ]
     },
@@ -887,7 +887,7 @@
      "cell_type": "markdown",
      "metadata": {
       "slideshow": {
-       "slide_type": "-"
+       "slide_type": "subslide"
       }
      },
      "source": [