diff --git a/nmap.cc b/nmap.cc
index d7da82c14..2a2cb642a 100644
--- a/nmap.cc
+++ b/nmap.cc
@@ -281,6 +281,9 @@ printf("%s %s ( %s )\n"
        "  --script-args=<n1=v1,[n2=v2,...]>: provide arguments to scripts\n"
        "  --script-trace: Show all data sent and received\n"
        "  --script-updatedb: Update the script database.\n"
+       "  --script-help=<Lua scripts>: Show help about scripts.\n"
+       "           <Lua scripts> is a comma separted list of script-files or\n"
+       "           script-categories.\n"
 #endif
        "OS DETECTION:\n"
        "  -O: Enable OS detection\n"