From e165fa3c85d00cb984f4d9635ed60909a1266ce1 Mon Sep 17 00:00:00 2001
From: Yuxuan 'fishy' Wang <yuxuan.wang@reddit.com>
Date: Wed, 30 Mar 2022 13:37:19 -0700
Subject: THRIFT-5541: Clarify on THeader key/value format in the spec

[skip ci]
---
 doc/specs/HeaderFormat.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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.
 
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