ansible/ansible-modules-core — pull request #442 by follower (2014-12-04 12:18:34+00:00)
Title: Note that `rsync` must be installed on both local & remote machine

For `synchronize` to work `rsync` must be installed on both local & remote machine (as appropriate for source/destination).

In particular, if `rsync` is not installed on the remote machine the following error message will be encountered:

"rsync error: remote command not found"