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@@ -7,3 +7,6 @@ map of differences for quick navigation.
tkdiff knows about AccuRev, BitKeeper, ClearCase, CVS, Git,
Mercurial, Perforce, PVCS, RCS, SCCS & Subversion.
+The Git functionality requires that you prefix tags &c. with "-r",
+unlike with git-diff.
+The extensive online help is well worth reading.