diff --git a/selected/http_to_phy.md b/selected/http_to_phy.md
index 4c6c18a..a0f0af5 100644
--- a/selected/http_to_phy.md
+++ b/selected/http_to_phy.md
@@ -129,3 +129,4 @@ Good learning resources for DNS:
 - BGP
 - TLS/SSL
 - Inspection and Testing Tools: tcpdump, wireshark, netcat and more
+- HTTP/2, HTTP/3