All reports of experimental-to-unstable-without-comment for the archive. The extended description of this tag is:

The previous version of this package had a distribution of experimental, this version has a distribution of unstable, and there's apparently no comment about the change of distributions (Lintian looks for the phrase "to unstable"). This may indicate a mistake in setting the distribution and accidentally uploading to unstable a package intended for experimental.

Severity: pedantic, Certainty: possible

Check: changelog-file, Type: binary

This tag has not been emitted in any package tested by Lintian.