diff --git a/lessons/04_Step_3.ipynb b/lessons/04_Step_3.ipynb
index a5b36309..1454aa45 100644
--- a/lessons/04_Step_3.ipynb
+++ b/lessons/04_Step_3.ipynb
@@ -27,7 +27,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "You should have completed Steps [1](./01_Step_1.ipynb) and [2](./02_Step_2.ipynb) before continuing. This IPython notebook continues the presentation of the **12 steps to Navier–Stokes**, the practical module taught in the interactive CFD class of [Prof. Lorena Barba](http://lorenabarba.com). "
+    "You should have completed Steps [1](./01_Step_1.ipynb) and [2](./02_Step_2.ipynb) before continuing. This Jupyter notebook continues the presentation of the **12 steps to Navier–Stokes**, the practical module taught in the interactive CFD class of [Prof. Lorena Barba](http://lorenabarba.com). "
    ]
   },
   {