Add note about SHA1 stability to readme

Signed-off-by: Rocco Rutte <pdmef@gmx.net>

diff --git a/README.txt b/README.txt
index d28a0969b4d6a3dd6b960240a3909489d138de43..49594613890ab2a2f32aa19e44e97217e68f1849 100644 (file)
--- a/README.txt
+++ b/README.txt
@@ -34,3 +34,12 @@ or any prior repository analysis: if just feeds what it finds into
 git-fast-import. This also implies that it heavily relies on strictly
 linear ordering of changesets from hg, i.e. its append-only storage
 model so that changesets hg2git already saw never get modified.
+
+Import and SHA stability
+========================
+
+Currently it's only supported to map one hg repository to one git
+repository. However, all forks of a hg repo can be imported into one git
+repo each and then merged together (e.g. as different branches in the
+final git repo) since the checksums are stable, i.e. one particular hg
+changeset always produces the same git SHA1 checksum.