--changelog
option to the command line and it allows you to view package spreads changes (changelog) before or after updating packages.
/etc/yum/pluginconf.d/changelog.conf
[main] enabled=1 when=pre always=false
enabled = 0|1
when = pre|post
pre
.
always = true|false
true
, it causes to always print the changelog, removing the option from the command line.