diff --git a/README.md b/README.md
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@@ -7,9 +7,11 @@ code.json: An agency-wide metadata standard for software projects
 This repository contains documentation on code.json, a metadata standard used to collect information on the agency's software projects in compliance with [M-16-21](https://obamawhitehouse.archives.gov/sites/default/files/omb/memoranda/2016/m_16_21.pdf) and the [SHARE IT Act](https://www.congress.gov/bill/118th-congress/house-bill/9566/text/ih).
 
 - [metadata.md](./docs/metadata.md): Overview on code.json metadata standard
+- [agency-index.md](./docs/agency-index.md): Overview on agency-index.json file
 - [schemas](./schemas): code.json generic schema and agency-level schemas
 - [procedures.md](./docs/procedures.md): Procedures and tools on creating and updating metadata
 - [examples.md](./docs/examples.md): Good examples of metadata in current agency code.json files
+
 - [faq.md](./docs/faq.md): Frequently Asked Questions
 
 ### Project Vision
diff --git a/docs/agency-index.md b/docs/agency-index.md
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@@ -0,0 +1,14 @@
+## agency-index.json
+
+The SHARE IT Act requires federal agencies to publish metadata for their software projects. This metadata is compiled into an **agency-index.json** file, which serves as a centralized inventory of the agency's software portfolio.
+
+To create an agency-index.json:
+1. Identify GitHub organizations and other platforms where source code is hosted
+2. Generate the agency-index.json using the tools below. Learn more about usage in [procedures.md](https://github.com/DSACMS/gov-codejson/blob/main/docs/procedures.md#generate-an-agency-indexjson-file-for-agencies)
+  - [index-generator-website](https://dsacms.github.io/index-generator-website/)
+  - [index-generator python tool](https://github.com/DSACMS/codejson-index-generator)
+3. Provide the index at:
+  - Agency's top level domain (TLD)
+  - A GitHub repository
+
+Agency index files are found here: https://github.com/DSACMS/code-gov/tree/main/agency-indexes
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