diff --git a/feed.xml b/feed.xml
index e8efa8a..66a4caa 100644
--- a/feed.xml
+++ b/feed.xml
@@ -5,8 +5,8 @@
  <description>I'm sick of complex blogging solutions, so markdown files in a git repo it is.</description>
  <link>https://github.com/francisrstokes/githublog</link>
  <copyright>2024 Francis Stokes - All rights reserved</copyright>
- <lastBuildDate>Sat, 11 May 2024 21:29:37 GMT</lastBuildDate>
- <pubDate>Sat, 11 May 2024 21:29:37 GMT</pubDate>
+ <lastBuildDate>Wed, 29 May 2024 17:56:32 GMT</lastBuildDate>
+ <pubDate>Wed, 29 May 2024 17:56:32 GMT</pubDate>
  <ttl>1440</ttl>
 
 <item>
@@ -49,6 +49,14 @@
   <pubDate>Fri, 10 May 2024 00:00:00 GMT</pubDate>
 </item>
 
+<item>
+  <title>Everything I Know About The Fast Inverse Square Root Algorithm
+</title>
+  <description>The fast inverse square root algorithm, made famous (though not invented) by programming legend John Carmack in the Quake 3 source code, computes an inverse square root $\frac{1}{\sqrt{x}}$ with a bewildering handful of lines that interpret and manipulate the raw bits of float. It's wild....</description>
+  <link>https://github.com/francisrstokes/githublog/blob/main/2024/5/29/fast-inverse-sqrt.md</link>
+  <pubDate>Wed, 29 May 2024 00:00:00 GMT</pubDate>
+</item>
+
 
 </channel>
 </rss>