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 ## Big O Notation
 
-Order of growth of algorithms specified in Big O notation. Source: [Big O Cheat Sheet](http://bigocheatsheet.com/).
+Order of growth of algorithms specified in Big O notation.
 
-![Big O graphs](https://github.com/trekhleb/javascript-algorithms/blob/master/assets/big-O-graph.png)
+![Big O graphs](https://github.com/trekhleb/javascript-algorithms/blob/master/assets/big-o-graph.png)
+
+Source: [Big O Cheat Sheet](http://bigocheatsheet.com/).
 
 Below is the list of some of the most used Big O notations and their performance comparisons against different sizes of the input data.
 
diff --git a/src/data-structures/README.md b/src/data-structures/README.md
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 - [YouTube Playlist](https://www.youtube.com/playlist?list=PLLXdhg_r2hKA7DPDsunoDZ-Z769jWn4R8)
 
+## Common Data Structure Operations
+
+![Common Data Structure Operations](https://github.com/trekhleb/javascript-algorithms/blob/master/assets/big-o-graph.png)
+
+Source: [Big O Cheat Sheet](http://bigocheatsheet.com/).