The Complete Rust Programming Reference Guide

Writing documentation

To write documentation, we have special symbols for marking the start of documentation comments (doc comments hereafter). Docs are written in a similar fashion, the way we write comments, but they are treated differently compared to ordinary comments and are parsed by rustdoc. The doc comments are divided into two levels and use separate symbols to mark the start of the doc comment:

• Item level: These comments are meant for items within the module such as structs, enum declarations, functions, trait constants, and so on. They should appear above the item. For single-line comments, they start with ///, while multi-line comments begin with /** and end with */.
• Module level: These are comments that appear at the root level, ...