add link to video 21

shera-amit · Jun 21, 2016 · a920f5a · a920f5a
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diff --git a/README.md b/README.md
@@ -28,7 +28,7 @@ The [IPython/Jupyter Notebook](http://nbviewer.jupyter.org/github/justmarkham/pa
 18. [What do I need to know about the pandas index? (Part 2)](https://www.youtube.com/watch?v=15q-is8P_H4&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=18) (10:38)
 19. [How do I select multiple rows and columns from a pandas DataFrame?](https://www.youtube.com/watch?v=xvpNA7bC8cs&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=19) (21:46)
 20. [When should I use the "inplace" parameter in pandas?](https://www.youtube.com/watch?v=XaCSdr7pPmY&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=20) (10:18)
-21. How do I make my pandas DataFrame smaller and faster? (coming June 21)
+21. [How do I make my pandas DataFrame smaller and faster?](https://www.youtube.com/watch?v=wDYDYGyN_cw&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=21) (19:05)
 22. How do I use pandas with scikit-learn to create Kaggle submissions? (coming June 28)
 
 ### Datasets

diff --git a/pandas.ipynb b/pandas.ipynb
@@ -10860,7 +10860,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## 21. How do I make my pandas DataFrame smaller and faster? (video)"
+    "## 21. How do I make my pandas DataFrame smaller and faster? ([video](https://www.youtube.com/watch?v=wDYDYGyN_cw&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=21))"
    ]
   },
   {