diff --git a/client/connection.go b/client/connection.go
index 534ea2a..8087a38 100644
--- a/client/connection.go
+++ b/client/connection.go
@@ -108,7 +108,8 @@ type Config struct {
 	Sasl sasl.Client
 
 	// Replaceable function to customise the 433 handler's new nick.
-	// By default an underscore "_" is appended to the current nick.
+	// By default the current nick's last character is "incremented".
+	// See DefaultNewNick implementation below for details.
 	NewNick func(string) string
 
 	// Client->server ping frequency, in seconds. Defaults to 3m.