diff --git a/doc/index.md b/doc/index.md
index 04f0f4c..5bf408c 100644
--- a/doc/index.md
+++ b/doc/index.md
@@ -1,3 +1,9 @@
 # Index of IRC protocol documentation.
 
+> [!IMPORTANT]
+> 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`
+
 * [Formatting of socket](formatting.md)
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