# For Developers
Each book has various commands in `header.tex` which help with writing.

- `\d`: Prints "**(Diagram \<num\>)**", where \<num\> is the next diagram number.
- `\diagram{fen#1}{fen#2}`: Displays 2 diagrams. This should be how diagrams are styled.
- `\example`: Same as `\d`, but displays the next example.