diff --git a/bip-0085.mediawiki b/bip-0085.mediawiki
index c6a7d2b8f3..50df273eb7 100644
--- a/bip-0085.mediawiki
+++ b/bip-0085.mediawiki
@@ -435,7 +435,8 @@ Each <code>identity</code> is an independent, unlinkable Nostr key namespace, an
 Identity index <code>0'</code> and account index <code>0'</code> are reserved for future
 key-management use, such as proof-of-linkage between an identity's keys, key rotation, and
 revocation. Their semantics are out of scope for this BIP and may be specified by a future
-NIP. Usable signing keys therefore start at <code>identity >= 1'</code> and
+NIP. Implementations should throw an error if a reserved index is provided as input.
+Usable signing keys therefore start at <code>identity >= 1'</code> and
 <code>account_index >= 1'</code>.
 
 The standard application of BIP-85 produces 64 bytes of entropy. Take the first 32 bytes
@@ -492,6 +493,12 @@ BIP32, BIP39,
 
 ==Changelog==
 
+===2.1.1 (2026-09-12)===
+
+====Changed====
+
+* Nostr application should error for reserved index
+
 ===2.1.0 (2026-08-02)===
 
 ====Added====