diff --git a/content/guides.json b/content/guides.json
index 91963b6e2..58c2fc0f7 100644
--- a/content/guides.json
+++ b/content/guides.json
@@ -1,13 +1,13 @@
 [
   {
-    "title": "Random Numbers: Are they?",
-    "description": "Learn how they are generated and why they may not be truly random.",
-    "url": "/guides/random-numbers",
-    "fileName": "random-numbers",
+    "title": "Asymptotic Notation",
+    "description": "Learn the basics of measuring the time and space complexity of algorithms",
+    "url": "/guides/asymptotic-notation",
+    "fileName": "asymptotic-notation",
     "featured": true,
     "author": "kamranahmedse",
-    "updatedAt": "2020-03-15T15:48:21.191Z",
-    "createdAt": "2020-03-15T15:48:21.191Z"
+    "updatedAt": "2020-04-03T15:48:21.191Z",
+    "createdAt": "2020-04-03T15:48:21.191Z"
   },
   {
     "title": "Big-O Notation",
@@ -16,6 +16,16 @@
     "fileName": "big-o-notation",
     "featured": true,
     "author": "kamranahmedse",
+    "updatedAt": "2020-03-15T15:48:21.191Z",
+    "createdAt": "2020-03-15T15:48:21.191Z"
+  },
+  {
+    "title": "Random Numbers: Are they?",
+    "description": "Learn how they are generated and why they may not be truly random.",
+    "url": "/guides/random-numbers",
+    "fileName": "random-numbers",
+    "featured": true,
+    "author": "kamranahmedse",
     "updatedAt": "2020-03-14T15:48:21.191Z",
     "createdAt": "2020-03-14T15:48:21.191Z"
   },
diff --git a/content/guides/asymptotic-notation.md b/content/guides/asymptotic-notation.md
new file mode 100644
index 000000000..7e6517968
--- /dev/null
+++ b/content/guides/asymptotic-notation.md
@@ -0,0 +1,5 @@
+Asymptotic notation is the standard way of measuring the time and space that an algorithm will consume as the input grows. In one of my last guides, I covered "Big-O notation" and a lot of you asked for a similar one for Asymptotic notation. You can find the [previous guide here](/guides/big-o-notation).
+
+![](/guides/asymptotic-notation.png)
+
+Here is the [original tweet](https://twitter.com/kamranahmedse/status/1243861514907418624) where this image was posted.
diff --git a/content/guides/random-numbers.md b/content/guides/random-numbers.md
index 10de9181c..0a04b0234 100644
--- a/content/guides/random-numbers.md
+++ b/content/guides/random-numbers.md
@@ -1,3 +1,5 @@
 Random numbers are everywhere from computer games to lottery systems, graphics software, statistical sampling, computer simulation and cryptography. Graphic below is a quick explanation to how the random numbers are generated and why they may not be truly random. 
 
 ![](/guides/random-numbers.png)
+
+Here is the [original tweet](https://twitter.com/kamranahmedse/status/1237851549302312962) where this image was posted.
diff --git a/content/roadmaps.json b/content/roadmaps.json
index 88952a472..f237b4cf5 100644
--- a/content/roadmaps.json
+++ b/content/roadmaps.json
@@ -43,7 +43,7 @@
       "2018",
       "2017"
     ],
-    "contributorsCount": 1,
+    "contributorsCount": 2,
     "contributorsUrl": "/frontend/contributors",
     "url": "/frontend",
     "sidebar": {}
diff --git a/public/guides/asymptotic-notation.png b/public/guides/asymptotic-notation.png
new file mode 100644
index 000000000..8e7f17e53
Binary files /dev/null and b/public/guides/asymptotic-notation.png differ
diff --git a/public/sitemap.xml b/public/sitemap.xml
index 18173b783..f7cef8eb7 100644
--- a/public/sitemap.xml
+++ b/public/sitemap.xml
@@ -31,13 +31,19 @@
               <priority>1.0</priority>
           </url>
 <url>
-              <loc>https://roadmap.sh/guides/random-numbers</loc>
+              <loc>https://roadmap.sh/guides/asymptotic-notation</loc>
+              <changefreq>monthly</changefreq>
+              <lastmod>2020-04-03T15:48:21.191Z</lastmod>
+              <priority>1.0</priority>
+          </url>
+<url>
+              <loc>https://roadmap.sh/guides/big-o-notation</loc>
               <changefreq>monthly</changefreq>
               <lastmod>2020-03-15T15:48:21.191Z</lastmod>
               <priority>1.0</priority>
           </url>
 <url>
-              <loc>https://roadmap.sh/guides/big-o-notation</loc>
+              <loc>https://roadmap.sh/guides/random-numbers</loc>
               <changefreq>monthly</changefreq>
               <lastmod>2020-03-14T15:48:21.191Z</lastmod>
               <priority>1.0</priority>