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-rw-r--r--rend-spec-v3.txt1
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diff --git a/rend-spec-v3.txt b/rend-spec-v3.txt
index 1a0b945..fac1395 100644
--- a/rend-spec-v3.txt
+++ b/rend-spec-v3.txt
@@ -1550,6 +1550,7 @@ Table of contents:
The EXT_FIELD_TYPE, EXT_FIELD_LEN, EXT_FIELD entries are reserved for
extensions to the introduction protocol. Extensions with
unrecognized EXT_FIELD_TYPE values must be ignored.
+ (`EXT_FIELD_LEN` may be zero, in which case EXT_FIELD is absent.)
Unless otherwise specified in the documentation for an extension type:
* Each extension type SHOULD be sent only once in a message.