Commit import instructions for future maintainers

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diff --git a/contrib/groff/FREEBSD-upgrade b/contrib/groff/FREEBSD-upgrade
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+This directory contains virgin copies of the original distribution files
+on a "vendor" branch.  Do not, under any circumstances, attempt to upgrade
+the files in this directory via patches and a cvs commit.
+
+To upgrade to a newer version of groff, when it is available:
+	1. Unpack the new version into an empty directory.
+	   [Do not make ANY changes to the files.]
+
+	2. Use the command:
+		cvs import -m 'Virgin import of FSF groff v<version>' \
+			src/contrib/groff FSF v<version>
+
+	   For example, to do the import of version 1.10, I typed:
+		cvs import -m 'Virgin import of FSF groff v1.10' \
+			src/contrib/groff FSF v1_10
+
+	3. Follow the instructions printed out in step 2 to resolve any
+	   conflicts between local FreeBSD changes and the newer version.
+
+Do not, under any circumstances, deviate from this procedure.
+
+To make local changes to tcpdump, simply patch and commit to the main
+branch (aka HEAD).  Never make local changes on the FSF branch.
+
+All local changes should be submitted to "jjc@jclark.com" for
+inclusion in the next vendor release.
+
+pst@freebsd.org - 7 Sep 1996