diff --git a/script/monitor/checks/GENERIC_NGINX_CHECK.sh b/script/monitor/checks/GENERIC_NGINX_CHECK.sh
index 2b734c6..b086410 100755
--- a/script/monitor/checks/GENERIC_NGINX_CHECK.sh
+++ b/script/monitor/checks/GENERIC_NGINX_CHECK.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-_REMOTE_HOST="${1:?"FQDN of server missing"}"
+_REMOTE_HOST="${1:?"FQDN of server missing: e.g. host.example.net[:port]"}"
 _REMOTE_PORT="${_REMOTE_HOST}:"
 _REMOTE_PORT="${_REMOTE_PORT#*:}"
 _REMOTE_PORT="${_REMOTE_PORT%%:*}"
diff --git a/script/monitor/checks/GENERIC_ZFSPOOL_USAGE_CHECK.sh b/script/monitor/checks/GENERIC_ZFSPOOL_USAGE_CHECK.sh
index ad3099d..c9a8fa5 100755
--- a/script/monitor/checks/GENERIC_ZFSPOOL_USAGE_CHECK.sh
+++ b/script/monitor/checks/GENERIC_ZFSPOOL_USAGE_CHECK.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-_REMOTE_HOST="${1:?"FQDN of server missing"}"
+_REMOTE_HOST="${1:?"FQDN of server missing: e.g. host.example.net[:port]"}"
 _REMOTE_PORT="${_REMOTE_HOST}:"
 _REMOTE_PORT="${_REMOTE_PORT#*:}"
 _REMOTE_PORT="${_REMOTE_PORT%%:*}"