diff --git a/docs/documentation/diagrams/infrastructure.md b/docs/documentation/diagrams/infrastructure.md
index 267cdee..425d4f3 100644
--- a/docs/documentation/diagrams/infrastructure.md
+++ b/docs/documentation/diagrams/infrastructure.md
@@ -20,8 +20,9 @@ classDiagram
 
 Raspberry Pi --> NodeJS
 Raspberry Pi --> Database
-NodeJS <--> Android Application : Request exercise data from database
+NodeJS <--> Android Application : Request exercise data from database. Send ip adress to cache
 Database <--> NodeJS : Database queries
+NodeJS --> ESP8266 : Get pepper ip
 
 
 ESP8266 --> Android Application : Send rotation data via WiFi to\n Pepper Web Server
@@ -48,6 +49,7 @@ namespace Server {
     class NodeJS {
         +MariaDB
         +Handle requests
+        +Cache pepper IP
     }
 }