Update README

README.md

@@ -187,7 +187,7 @@ First you need to create a Discord bot user, which you can do by following the i
     // Patterns, represented by {$patternName}, are replaced when sending messages
     "commandPrelude": "Command sent by {$nickname}", // Message sent before a command
     "ircText": "<{$displayUsername} [@{$discordUsername}]> {$text}", // When sending a message to IRC
-    "urlAttachment": "<{$displayUsername}> {$attachmentURL}", // When sending a Discord attachment to IRC
+    "urlAttachment": "<{$displayUsername} [@{$discordUsername}]> {$attachmentURL}", // When sending a Discord attachment to IRC
     "discord": "**<{$author}>** {$withMentions}", // When sending a message to Discord
     // Other patterns that can be used:
     // {$discordChannel} (e.g. #general)