diff --git a/content/guides.json b/content/guides.json
index 5593821b7..77529d6fc 100644
--- a/content/guides.json
+++ b/content/guides.json
@@ -1,4 +1,14 @@
[
+ {
+ "title": "Big-O Notation",
+ "description": "Easy to understand explanation of Big-O notation without any fancy terms",
+ "url": "/guides/big-o-notation",
+ "fileName": "big-o-notation",
+ "featured": true,
+ "author": "kamranahmedse",
+ "updatedAt": "2020-03-14T15:48:21.191Z",
+ "createdAt": "2020-03-14T15:48:21.191Z"
+ },
{
"title": "How does the internet work?",
"description": "Learn the basics of internet and everything involved with this short video series",
diff --git a/content/guides/big-o-notation.md b/content/guides/big-o-notation.md
new file mode 100644
index 000000000..7da03bb5c
--- /dev/null
+++ b/content/guides/big-o-notation.md
@@ -0,0 +1,5 @@
+Big-O notation is the mathematical notation that helps analyse the algorithms to get an idea about how they might perform as the input grows. The image below explains Big-O in a simple way without using any fancy terminology.
+
+![](/guides/big-o-notation.png)
+
+Here is the [original tweet](https://twitter.com/kamranahmedse/status/1235708842610212864) where this image was posted.
diff --git a/public/guides/big-o-notation.png b/public/guides/big-o-notation.png
new file mode 100644
index 000000000..1afe6efca
Binary files /dev/null and b/public/guides/big-o-notation.png differ
diff --git a/public/sitemap.xml b/public/sitemap.xml
index 888a5d556..fe244b7df 100644
--- a/public/sitemap.xml
+++ b/public/sitemap.xml
@@ -30,6 +30,12 @@
2020-01-29T07:49:29.706Z
1.0
+
+ https://roadmap.sh/guides/big-o-notation
+ monthly
+ 2020-03-14T15:48:21.191Z
+ 1.0
+
https://roadmap.sh/guides/what-is-internet
monthly