What in the meaning of the message "warning: last-modified not specified" in RC4?

[Paul Spencer]

After upgrading to maven-1.0-rc4, the following message started 
appearing when snapshot dependencies were being downloaded:
  warning: last-modified not specified

What does this mean?
I am seeing this message for all snapshots dependency defined in the 
project.  It does not matter if the snapshot exist in my own repository 
or in the ibiblio repository, like commons-naming-core-SNAPSHOT.jar.

Paul Spencer
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