diff --git a/19.md b/19.md
index 4787ecd575..eb350a536c 100644
--- a/19.md
+++ b/19.md
@@ -67,3 +67,4 @@ These possible standardized `TLV` types are indicated here:
 
 - `npub` keys MUST NOT be used in NIP-01 events or in NIP-05 JSON responses, only the hex format is supported there.
 - When decoding a bech32-formatted string, TLVs that are not recognized or supported should be ignored, rather than causing an error.
+- Bech32-formatted strings SHOULD be limited in size to 5000 characters.