Valadoc Guide
valadoc is a command line tool that generates Vala programming documentation from a library's API (Application Programming Interface).
The library's API can be written manually in a VAPI file or in a VAPI file or generated automatically from source files and held in a GIR (GObject Introspection Repository) file. valadoc can generate documentation from both a VAPI file or a GIR file.
If the library is written in Vala then valadoc can generate the documentation from the library's Vala source files.