diff --git a/scripts/http-slowloris.nse b/scripts/http-slowloris.nse
index 87584e06b..4cc0638b7 100644
--- a/scripts/http-slowloris.nse
+++ b/scripts/http-slowloris.nse
@@ -60,6 +60,9 @@ author = {"Aleksandar Nikolic", "Ange Gutek"}
 license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
 categories = {"dos", "intrusive"}
 
+-- Note: The http-slowloris script has lots of script-level variables that will
+-- probably conflict with each other when scanning multiple services.
+-- See https://github.com/nmap/nmap/issues/63
 
 portrule = shortport.http