Many of Rust's errors come with error codes, and you can request extended
diagnostics from the compiler on those errors. You can also [read them
-here](error-index.html), if you prefer to read them that way.
+here](error_codes/index.html), if you prefer to read them that way.
# Master Rust
[The Reference](reference/index.html) is not a formal spec, but is more detailed and
comprehensive than the book.
+## The Style Guide
+
+[The Rust Style Guide](style-guide/index.html) describes the standard formatting of Rust
+code. Most developers use rustfmt to format their code, and rustfmt's default
+formatting matches this style guide.
+
## The Rustonomicon
[The Rustonomicon](nomicon/index.html) is your guidebook to the dark arts of unsafe