diff --git a/src/conf.py b/src/conf.py
index b2eab36af..6eee9d241 100644
--- a/src/conf.py
+++ b/src/conf.py
@@ -128,7 +128,10 @@ class ValidPrefixChars(registry.String):
 supybot.register('prefixChars', ValidPrefixChars('', """Determines what prefix
 characters the bot will reply to.  A prefix character is a single character
 that the bot will use to determine what messages are addressed to it; when
-there are no prefix characters set, it just uses its nick."""))
+there are no prefix characters set, it just uses its nick.  Each character in
+this string is interpreted individually; you can have multiple prefixChars
+simultaneously, and if any one of them is used as a prefix the bot will
+assume it is being addressed."""))
 
 supybot.register('defaultCapabilities',
 registry.CommaSeparatedSetOfStrings(['-owner', '-admin', '-trusted'], """