diff --git a/testssl.sh b/testssl.sh
index 95732d9..77eec36 100755
--- a/testssl.sh
+++ b/testssl.sh
@@ -221,7 +221,7 @@ APPEND=${APPEND:-false}                 # append to csv/json file instead of ove
 HAS_IPv6=${HAS_IPv6:-false}             # if you have OpenSSL with IPv6 support AND IPv6 networking set it to yes
 ALL_CLIENTS=${ALL_CLIENTS:-false}       # do you want to run all client simulation form all clients supplied by SSLlabs?
 
-########### Tuning vars which cannot be set by a cmd line switch
+########### Tuning vars which cannot be set by a cmd line switch. Use instead e.g "HEADER_MAXSLEEP=10 ./testssl.sh <your_args_here>"
 #
 EXPERIMENTAL=${EXPERIMENTAL:-false}
 HEADER_MAXSLEEP=${HEADER_MAXSLEEP:-5}   # we wait this long before killing the process to retrieve a service banner / http header