diff --git a/references/functions-typescript.md b/references/functions-typescript.md
index 4346c86..13d752a 100644
--- a/references/functions-typescript.md
+++ b/references/functions-typescript.md
@@ -395,9 +395,13 @@ Not all Node.js APIs are available. What works:
 
 - `console.log` / `console.info` — fully supported, output visible in Satellite logs and Console UI
 - `Math.random()` — supported but seeded once after upgrade, not suitable for lotteries or unpredictable randomness
+- `Blob` — immutable raw binary data
+- `URL` / `URLSearchParams` — URL parsing and manipulation
 
 No `fs`, `http`, `crypto` from Node, and many npm packages that rely on those will not work. Missing polyfills are added iteratively — open an issue if you're blocked.
 
+> For HTTP calls (`fetch`), use `httpRequest` from `@junobuild/functions/ic-cdk` instead.
+
 ---
 
 ## Limitations