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--- a/README.txt
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 This repository contains a mirror of the old mspgcc repositories, both cvs
-and bzr.  The scripts below were used to retrieve the data.  Unfortunately,
-several issues prevent a clean tracking of the history:
+and bzr.  Each repository or module branch is in a separate git branch.  The
+scripts below were used to retrieve the data.
+
+The primary purpose of this repository is research into the history of the
+development of mspgcc.  Such research may include identifying contributors
+for the purpose of obtaining copyright releases (required for push to
+upstream GNU projects), and understanding the reasons for various code
+updates based on context present in the commit messages.
+
+Unfortunately, several issues prevent a clean tracking of the history:
 
 - The BZR and CVS timestamps for certain older commits differ by some number
   of hours, possibly related to the time zones of the committers or whoever
-  did the original conversion
+  did the original conversion.  The difference varies by commit within an
+  origin repository.
 
 - Similarly, non-ASCII characters in the commit messages are handled
   differently in the two repositories.
 
-The net result is that the git SHA1 values for the commits are not
-identical between the CVS and BZR histories.  You can, however, do a diff
-between the branches to verify their content is consistent.
+The net result is that the git SHA1 values for the commits are not identical
+between the CVS and BZR histories, even though the actual content is
+identical.  The best you can do is a diff between the branches to verify
+their content is consistent.
 
 cvs-fetch.sh - Use git cvsimport to retrieve each of the CVS modules into
    its own repository

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