diff --git a/04-agents-custom-instructions/README.md b/04-agents-custom-instructions/README.md
index a84d889..080531c 100644
--- a/04-agents-custom-instructions/README.md
+++ b/04-agents-custom-instructions/README.md
@@ -67,6 +67,7 @@ Never used or made an agent? Here's all you need to know to get started for this
 | **Plan** | `/plan` or `Shift+Tab` (cycle modes) | Creates step-by-step implementation plans before coding |
 | **Code-review** | `/review` | Reviews staged/unstaged changes with focused, actionable feedback |
 | **Init** | `/init` | Generates project configuration files (instructions, agents) |
+| **Critic** | *Automatic (experimental)* | Automatically reviews plans and complex implementations using a complementary model to catch errors early. Available when using Claude models with experimental mode enabled (`--experimental`). |
 | **Explore** | *Automatic* | Used internally when you ask Copilot to explore or analyze the codebase |
 | **Task** | *Automatic* | Executes commands like tests, builds, lints, and dependency installs |
 
diff --git a/05-skills/README.md b/05-skills/README.md
index 1369aba..6dd85f5 100644
--- a/05-skills/README.md
+++ b/05-skills/README.md
@@ -54,7 +54,9 @@ Learn what skills are, why they matter, and how they differ from agents and MCP.
    copilot
    > /skills list
    ```
-   This shows all skills Copilot can find in your project and personal folders.
+   This shows all skills Copilot can find — including **built-in skills that ship with the CLI** as well as any project or personal skills you've created.
+
+   > 💡 **Built-in skills**: Starting with v1.0.17, the Copilot CLI includes built-in skills out of the box. The first built-in skill is a guide for customizing the Copilot cloud agent's environment (e.g., pre-installing tools and dependencies via `copilot-setup-steps.yml`). You'll see it listed as `customizing-copilot-cloud-agents-environment` when you run `/skills list`. These built-in skills are always available without any setup needed.
 
 2. **Look at a real skill file:** Check out our provided [code-checklist SKILL.md](../.github/skills/code-checklist/SKILL.md) to see the pattern. It's just YAML frontmatter plus markdown instructions.
 
@@ -267,7 +269,7 @@ Build your own skills from SKILL.md files.
 
 ## Skill Locations
 
-Skills are stored in `.github/skills/` (project-specific) or `~/.copilot/skills/` (user level).
+Skills are stored in `.github/skills/` (project-specific) or `~/.copilot/skills/` (user level). The CLI also includes **built-in skills** that are always available without any setup.
 
 ### How Copilot Finds Skills
 
@@ -275,6 +277,7 @@ Copilot automatically scans these locations for skills:
 
 | Location | Scope |
 |----------|-------|
+| **Built-in** | Included with the CLI — always available, no setup needed |
 | `.github/skills/` | Project-specific (shared with team via git) |
 | `~/.copilot/skills/` | User-specific (your personal skills) |