diff --git a/SRC/test-echoping-tos b/SRC/test-echoping-tos
index db78144..440f5e2 100755
--- a/SRC/test-echoping-tos
+++ b/SRC/test-echoping-tos
@@ -7,6 +7,7 @@ echo "Since this tests tries remote servers, a failure is not always "
 echo " echoping's fault: it may be a network problem."
 echo "On some systems, you may NEED to be root."
 
+# Raise the precedence to "critic" (RFC 791, section 3.1)
 ./echoping -P 0xa0 -h / www.gullitv.fr
 
 # IPTOS_THROUGHPUT