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-rw-r--r--doc/specs/HeaderFormat.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/specs/HeaderFormat.md b/doc/specs/HeaderFormat.md
index 9b74159a5..bcd1e2d4d 100644
--- a/doc/specs/HeaderFormat.md
+++ b/doc/specs/HeaderFormat.md
@@ -78,5 +78,6 @@ This allows us to distinguish between different (older) transports.
INFO_KEYVALUE 0x01 - varint32 number of headers.
- key/value pairs of varstrings (varint16 length plus
- no-trailing-null string).
+ no-trailing-null string). Implementations MUST NOT
+ alter either key or value in any way.