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-rw-r--r--doc/doc-txt/experimental-spec.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index 4be142e66..4e244ac5f 100644
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -820,6 +820,10 @@ Caveats:
should try to stick to one ADMD, so pick a primary domain and use that for
AR headers and outbound signing.
+Signing is not compatible with cutthrough delivery; any (before expansion)
+value set for the option will result in cutthrough delivery not being
+used via the transport in question.
+
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