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+% Functions
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Function definitions in Rust start with `fn` and have a set of parentheses after the function name.
+> The curly brackets tell the compiler where the function body begins and ends.
+> We can call any function we’ve defined by entering its name followed by a set of parentheses. 
+
+```rust
+fn main() {
+    println!("Hello, world!");
+
+    another_function();
+}
+
+fn another_function() {
+    println!("Another function.");
+}
+```
+
+---
+
+Here are the relevant sections in the new and old books:
+
+* **[In the first edition: Ch 3.2 — Functions][1]**
+* <small>[in the current edition: Ch 3.03 — Functions][2]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/functions.html
+[2]: ch03-03-how-functions-work.html