diff --git a/46.md b/46.md
index a0e2d952..5624429a 100644
--- a/46.md
+++ b/46.md
@@ -161,6 +161,8 @@ The `content` field is a JSON-RPC-like message that is [NIP-44](44.md) encrypted
 - `results` is a string of the result of the call (this can be either a string or a JSON stringified object)
 - `error`, _optionally_, it is an error in string form, if any. Its presence indicates an error with the request.
 
+Requests made with unknown or unsupported methods MUST be replied with an error.
+
 ## Example flow for signing an event
 
 - `remote-signer-pubkey` is `fa984bd7dbb282f07e16e7ae87b26a2a7b9b90b7246a44771f0cf5ae58018f52`