diff --git a/UNB/Year 4/Semester 2/CS3873/2024-02-12.md b/UNB/Year 4/Semester 2/CS3873/2024-02-12.md
index 37f316f..b6726d3 100644
--- a/UNB/Year 4/Semester 2/CS3873/2024-02-12.md	
+++ b/UNB/Year 4/Semester 2/CS3873/2024-02-12.md	
@@ -2,3 +2,4 @@ Lecture Topic: UDP and Reliable Data Transfer
 
 Uses 1's compliment sum to do check-summing (info in slides)
 
+You use a system where you can imply the NACK request in packets, for example in TCP, NACKs are implied
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