diff --git a/README.md b/README.md
index bd74470..3f9b314 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ Options:
   -c target       run as client and connect to target server
   -e              measure time for connection establishment and first byte only
   -g              enable UDP generic segmentation offload
+  -l log-file     file to log tls secrets
   -p              port to listen on/connect to (default 18080)
   -s              run as server
   -t time (s)     run for X seconds (default 10s)