diff --git a/README.md b/README.md
index 75cfb5f..4ce760d 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,13 @@
 # Pea 2 Pea  
 very simple P2P VPN(Virtual Network yes, Private maybe),  
-this program is intended to help you play LAN games over internet  
+this program is intended to help you play LAN games over internet and as proof of concept  
 when all clients are behind Full-cone NAT, does not work with clients behind Symmetric NAT  
 at least for now  
 
+
+> [!WARNING]  
+> Piercing NAT may fail based on network configuration
+
 ## how to run  
 > install rustc and cargo or rustup, you will need 2024 edition  
 > build using