diff --git a/doc/index.md b/doc/index.md
index 5bf408c..f578637 100644
--- a/doc/index.md
+++ b/doc/index.md
@@ -4,6 +4,7 @@
 > Before you start reading this, here's what you need to know.
 > * We visualize the socket this way:  
 >   `↗️ Sent by client, recieved by server`  
->   `↙️ Sent by server, recieved by client`
+>   `↙️ Sent by server, recieved by client`  
+>   `🔁 Sent by server, recieved by a DIFFERENT client (e.g. target of PRIVMSG)`
 
 * [Formatting of socket](formatting.md)
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