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diff --git a/doc/dir-spec.txt b/doc/dir-spec.txt
index 4480f17b12..5007369476 100644
--- a/doc/dir-spec.txt
+++ b/doc/dir-spec.txt
@@ -167,4 +167,9 @@ router in transport domain B must have pushed its descriptor to a directory
server in transport domain A, so that the directory server in transport domain
A can use that router to reach the directory server in transport domain B.
+When confronted with the choice of multiple different paths to reach the same
+router, the Blossom nodes may use a route selection protocol similar in design
+to that used by BGP (may be a simple distance-vector route selection procedure
+that only takes into account path length, or may be more complex to avoid
+loops, cache results, etc.) in order to choose the best one.