diff --git a/docs/viz/viz.ipynb b/docs/viz/viz.ipynb
index f1741c1c7e..723a70164b 100644
--- a/docs/viz/viz.ipynb
+++ b/docs/viz/viz.ipynb
@@ -8,7 +8,7 @@
    },
    "source": [
     "# Loading and visualizing results ([open in colab](https://colab.research.google.com/github/openai/baselines/blob/master/docs/viz/viz.ipynb))\n",
-    "In order to compare performance of algorithms, we often would like to visualize learning curves (reward as a function of time steps), or some other auxiliary information about learning aggregated into a plot. Baselines repo provides tools for doing so in several different ways, depending on the goal."
+    "In order to compare the performance of algorithms, we often would like to visualize learning curves (reward as a function of time steps), or some other auxiliary information about learning aggregated into a plot. Baselines repo provides tools for doing so in several different ways, depending on the goal."
    ]
   },
   {