diff --git a/rfc2.md b/rfc2.md
index 1f34da4..39544e6 100644
--- a/rfc2.md
+++ b/rfc2.md
@@ -22,6 +22,8 @@ All conformant bots MUST respond to `!botlist` with: (examples from [minerbot2](
 
 For conformance with [previous standards on other tilde boxes](http://tilde.town/wiki/bots/ircbots.html), bots SHOULD also respond to `!rollcall` with at least the command list.
 
+Please note that the prefix of `!` is constant: no matter the usual prefix of the bot, it MUST respond to `!botlist` and/or `!rollcall` with the given prefix.
+
 ### Usermode +B
 
 All bots on tilde.chat must set usermode +B on or near connect.