# CMP0106

New in version 3.18.

The `Documentation` module is removed.

The `Documentation` was added as a support mechanism for the VTK project and was tuned for that project. Instead of CMake providing this module with (now old) VTK patterns for cache variables and required packages, the module is now deprecated by CMake itself.

The `OLD` behavior of this policy is for `Documentation` to add cache variables and find VTK documentation dependent packages. The `NEW` behavior is to act as an empty module.

This policy was introduced in CMake version 3.18. CMake version 3.23.0-rc4 warns when the policy is not set and uses `OLD` behavior. Use the `cmake_policy()` command to set it to `OLD` or `NEW` explicitly.

Note

The `OLD` behavior of a policy is `deprecated by definition` and may be removed in a future version of CMake.