diff --git a/README.md b/README.md
index 0d0e05a83a..7e14d680ee 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,17 @@ This repository contains the .NET team's curated set of core skills and custom a
 
 Once configured, type `/plugins` in Copilot Chat or use the `@agentPlugins` filter in Extensions to browse and install plugins from the marketplace.
 
+### Codex CLI
+
+Skills in this repository follow the [agentskills.io](https://agentskills.io) open standard
+and are compatible with [OpenAI Codex](https://developers.openai.com/codex/skills).
+
+Install individual skills using the `skill-installer` CLI with the GitHub URL:
+
+```bash
+$ skill-installer install https://github.com/dotnet/skills/tree/main/plugins/<plugin>/skills/<skill-name>
+```
+
 ### ⚡ Agentic Workflows
 
 Some plugins include [GitHub Agentic Workflow](https://github.com/github/gh-aw) templates for CI/CD automation:
diff --git a/eng/reference-scanner/known-domains.txt b/eng/reference-scanner/known-domains.txt
index 41646d350e..dff5a324ef 100644
--- a/eng/reference-scanner/known-domains.txt
+++ b/eng/reference-scanner/known-domains.txt
@@ -53,6 +53,9 @@ github.com/microsoftdocs/visualstudio-docs
 github.com/modelcontextprotocol/csharp-sdk
 github.com/NuGet/docs.microsoft.com-nuget
 
+# Codex
+developers.openai.com
+
 # Community
 ollama.com
 stackoverflow.com