newbie question and help resolving warnings

[Gaetano_Giacalone]

have posted one of my first roles on galaxy, and I am getting warnings.

./galaxy/downloads/tmpQjSwNY/tasks/main.yml:40: [E503] Tasks that run when changed should likely be handlers

If someone would be so kind as to give me some pointers on where to look in order to resolve these warnings, it would be appreciated.

dagman62.apache_php

Thanks in advance

Gaetano

The block in question is:

• name: Unpacking Apache APR
  unarchive:
  copy: no
  dest: /tmp/
  src: “{{ apr_source.dest }}”
  when: apr_source is changed
  register: apr_source_unpack