install-file -Dsources vs. -Dclassifier=sources

For install-file, what's the difference between using -Dsources=... and
-Dclassifier=sources Dfile=...?  It seems that the latter is the given
example way to "attach" sources to a jar.  I tried using -Dsources=...,
and that doesn't seem to do anything/make any changes anywhere under
~/.m2/.  Thanks for any clarification.
--
Yang Zhang
http://www.mit.edu/~y_z/

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