diff --git a/lerntagebuch.md b/lerntagebuch.md
index 6e913dd..a75de6c 100644
--- a/lerntagebuch.md
+++ b/lerntagebuch.md
@@ -5,6 +5,7 @@
 - Pull-Request 1: https://git.spidermilk.ddnsfree.com/BeenToPrague/Java-Challenge/pulls/16
 - Pull-Request 2: https://git.spidermilk.ddnsfree.com/BeenToPrague/Java-Challenge/pulls/17
 - Pull-Request 3: https://git.spidermilk.ddnsfree.com/BeenToPrague/Java-Challenge/pulls/18
+- Pull-Request 4: https://git.spidermilk.ddnsfree.com/BeenToPrague/Java-Challenge/pulls/19
 
 ## SU 11 (18-01-2023)
 ### Lernziele