Add big O info.

DantesLin · Mar 30, 2018 · 74cd611 · 74cd611
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diff --git a/assets/big-O-graph.jpeg b/assets/big-O-graph.jpeg
diff --git a/assets/big-O-graph.png b/assets/big-O-graph.png
diff --git a/src/algorithms/README.md b/src/algorithms/README.md
@@ -8,7 +8,11 @@
 
 ## Big O Notation
 
-![Big O graphs](https://github.com/trekhleb/javascript-algorithms/blob/master/assets/big-O-graph.jpeg)
+Order of growth of algorithms specified in Big-O notation. Source: [Big-O Cheat Sheet](http://bigocheatsheet.com/).
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+![Big O graphs](https://github.com/trekhleb/javascript-algorithms/blob/master/assets/big-O-graph.png)
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+Below is the list of some of the most used Big O notations and their performance comparisons against different sizes of the input data.
 
 | Big O Notation | Computations for 10 elements | Computations for 100 elements | Computations for 10 elements  |
 | -------------- | ---------------------------- | ----------------------------- | ----------------------------- |