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+Tag: epoch-change-without-comment
+Severity: warning
+Check: debian/changelog
+Explanation: The previous version of this package had a different version epoch
+ (eg. 2:1.0-1) to the current version but there's no reference to this in
+ the changelog entry.
+ .
+ Epochs exist to cope with changes to the upstream version numbering
+ scheme. Whilst they are a powerful tool, increasing or adding an epoch
+ has many downsides including causing issues with versioned dependencies,
+ being misleading to users and being aesthetically unappealing. Whilst
+ they should be avoided, valid reasons to add or increment the epoch
+ include:
+ .
+ - Upstream changed their versioning scheme in a way that makes the
+ latest version lower than the previous one.
+ - You need to permanently revert to a lower upstream version.
+ .
+ Temporary revertions (eg. after an NMU) should use not modify or
+ introduce an epoch - please use the <code>CURRENT+reallyFORMER</code> until
+ you can upload the latest version again.
+ .
+ If you are unsure whether you need to increase the epoch for a package,
+ please consult the debian-devel mailing list.
+ .
+ Lintian looks in this version's changelog entry for the phrase "epoch".