diff --git a/rules/chain-of-density/rule.md b/rules/chain-of-density/rule.md
new file mode 100644
index 00000000000..ca1205e37ee
--- /dev/null
+++ b/rules/chain-of-density/rule.md
@@ -0,0 +1,73 @@
+---
+type: rule
+title: Do you use chain of density prompts for summarization?
+uri: chain-of-density
+authors:
+  - title: Seth Daily
+    url: https://www.ssw.com.au/people/seth-daily
+related: null
+created: 2023-09-18
+archivedreason: null
+guid: b962b782-e7a8-42ed-b045-f8f2e4c7bd1b
+---
+
+If you have a bunch of text to sum up, it can be time consuming to extract the most important parts. If you want a simple way to keep the important stuff, you should use chain of density (CoD).
+
+<!--endintro-->
+
+## What is Chain of Density?
+
+CoD is a way to make short but detailed summaries. It works automatically with one prompt:
+
+- Add important stuff step by step
+- Use feedback from people to check quality
+- See how it does against the usual GPT-4 way
+
+## Why Use CoD?
+
+### Keep it Short but Full of Info
+
+::: greybox
+Add important details one by one.
+:::
+
+::: good Figure: Good Example
+You keep only the info that matters most.
+:::
+
+### What Do People Say?
+
+::: greybox
+Ask people what they think to make it even better.
+:::
+
+::: good Figure: Good Example
+Feedback helps you make the summary useful for everyone.
+:::
+
+## CoD vs Regular GPT-4
+
+### Which is Better?
+
+::: greybox
+Regular GPT-4 can be off the mark.
+:::
+
+::: bad Figure: Bad Example
+It might include stuff you don't really need.
+:::
+
+::: greybox
+CoD aims to be more focused.
+:::
+
+::: good Figure: Good Example
+CoD is usually more on point.
+:::
+
+## How to Do CoD?
+
+### Example Prompt
+
+Here's an example prompt you can use to do CoD:
+