cyrus-doc software package provides Cyrus mail system - documentation files, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install cyrus-doc
cyrus-doc is installed in your system.
Make ensure the cyrus-doc package were installed using the commands given below,
$ sudo dpkg-query -l | grep cyrus-doc *
You will get with cyrus-doc package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | |
| Package | cyrus-doc |
| Version | 2.4.17+nocaldav-0~deb8u1 |
| Description | Cyrus mail system - documentation files |
| Sub Section |