README: Explain opkg-opk's raison d'être

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diff --git a/README b/README
index cbcddf2..12b09f7 100644
--- a/README
+++ b/README
@@ -5,6 +5,11 @@ opkg-opk provides information about packages built by opkbuild for opkg.
 It is similar to Debian's dpkg-deb, however it provides only control
 file printing and data file listing.
 
+opkg-opk exists to be able to list files in packages on other system
+distributions.  Whereas tar expects user and group IDs and names to
+match between the system that created an archive and the system that
+reads it, opkg-opk does no such verification.
+
 Copyright
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