## Documentation annotations

Documentation annotations can be used to add documentation to CIF elements. For basic information on documentation annotations, see the language tutorial. Here we discuss further details.

### Constraints

Documentation annotations (`@doc`) can be added to all elements of CIF specifications that support annotations.

The annotation has the following constraints, in addition to the general constraints that apply to all annotations:

- The annotation must have at least one argument.

- All arguments must be unnamed arguments.

- All arguments must have a `string`-typed value.

- It must be possible for the argument values to be statically evaluated.

- Evaluation of the argument values must not result in an evaluation error.

- If multiple arguments are given, each argument becomes a separate line of text in the order that they are given.