diff --git a/skills/public/frontend-design/SKILL.md b/skills/public/frontend-design/SKILL.md
index fceaa830..409a78a2 100644
--- a/skills/public/frontend-design/SKILL.md
+++ b/skills/public/frontend-design/SKILL.md
@@ -12,6 +12,16 @@ The user provides frontend requirements: a component, page, application, or inte
 
 **MANDATORY**: The entry HTML file MUST be named `index.html`. This is a strict requirement for all generated frontend projects to ensure compatibility with standard web hosting and deployment workflows.
 
+### CDN Requirement (China-Friendly)
+
+When generating plain HTML projects that reference third-party JS/CSS from CDN, prefer China-friendly CDN links by default:
+
+1. `https://cdn.bootcdn.net` (preferred)
+2. `https://cdn.staticfile.net` (fallback)
+3. `https://registry.npmmirror.com` (for npm package file URLs when needed)
+
+Avoid `unpkg.com` and `cdnjs.cloudflare.com` as primary CDN links in generated HTML.
+
 ## Design Thinking
 
 Before coding, understand the context and commit to a BOLD aesthetic direction: