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-rw-r--r--proposals/332-ntor-v3-with-extra-data.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/proposals/332-ntor-v3-with-extra-data.md b/proposals/332-ntor-v3-with-extra-data.md
index 8e6dedc..25ae0ba 100644
--- a/proposals/332-ntor-v3-with-extra-data.md
+++ b/proposals/332-ntor-v3-with-extra-data.md
@@ -343,6 +343,8 @@ server messages.
EXT_FIELD_LEN [one byte]
EXT_FIELD [EXT_FIELD_LEN bytes]
+(`EXT_FIELD_LEN` may be zero, in which case EXT_FIELD is absent.)
+
All parties MUST reject messages that are not well-formed per the
rules above.