diff --git a/scripts/broadcast-igmp-discovery.nse b/scripts/broadcast-igmp-discovery.nse
index 3cca9697f..415c782a2 100644
--- a/scripts/broadcast-igmp-discovery.nse
+++ b/scripts/broadcast-igmp-discovery.nse
@@ -39,7 +39,7 @@ interfaces.
 -- nmap --script broadcast-igmp-discovery
 -- nmap --script broadcast-igmp-discovery -e wlan0
 -- nmap --script broadcast-igmp-discovery
--- --script-args 'broadcast-igmp-discovery.version=all, broadcast-igmp-discovery.timeout=3'
+-- --script-args 'broadcast-igmp-discovery.version=all, broadcast-igmp-discovery.timeout=3s'
 --
 --@output
 --Pre-scan script results:
diff --git a/scripts/multicast-profinet-discovery.nse b/scripts/multicast-profinet-discovery.nse
index 99002fd35..060265fad 100755
--- a/scripts/multicast-profinet-discovery.nse
+++ b/scripts/multicast-profinet-discovery.nse
@@ -38,7 +38,7 @@ Reference:
 
 author = "Stefan Eiwanger, DINA-community"
 license = "BSD-2-Clause Plus Patent License. For further details, please refer https://spdx.org/licenses/BSD-2-Clause-Patent.html"
-categories = {"discovery","info", "safe"}
+categories = {"discovery","info", "safe", "broadcast"}
 
 prerule = function()
   if not nmap.is_privileged() then
diff --git a/scripts/targets-ipv6-multicast-echo.nse b/scripts/targets-ipv6-multicast-echo.nse
index 58cbfb842..6327dfcda 100644
--- a/scripts/targets-ipv6-multicast-echo.nse
+++ b/scripts/targets-ipv6-multicast-echo.nse
@@ -27,7 +27,7 @@ author = {"David Fifield", "Xu Weilin"}
 
 license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
 
-categories = {"discovery","broadcast"}
+categories = {"discovery", "broadcast", "safe"}
 
 
 prerule = function()
diff --git a/scripts/targets-ipv6-multicast-invalid-dst.nse b/scripts/targets-ipv6-multicast-invalid-dst.nse
index fa673ed37..132ef005c 100644
--- a/scripts/targets-ipv6-multicast-invalid-dst.nse
+++ b/scripts/targets-ipv6-multicast-invalid-dst.nse
@@ -30,7 +30,7 @@ author = {"David Fifield", "Xu Weilin"}
 
 license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
 
-categories = {"discovery","broadcast"}
+categories = {"discovery", "broadcast", "safe"}
 
 
 prerule = function()
diff --git a/scripts/targets-ipv6-multicast-mld.nse b/scripts/targets-ipv6-multicast-mld.nse
index b446b2b7b..aa5c7367e 100644
--- a/scripts/targets-ipv6-multicast-mld.nse
+++ b/scripts/targets-ipv6-multicast-mld.nse
@@ -50,7 +50,7 @@ responses from their multicast group.
 
 author = {"niteesh", "alegen"}
 license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
-categories = {"discovery","broadcast"}
+categories = {"discovery", "broadcast", "safe"}
 
 
 local arg_timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME .. '.timeout'))