diff --git a/napi b/napi
index 91a384e..933e047 100755
--- a/napi
+++ b/napi
@@ -271,6 +271,7 @@ while [ -n "$1" ]; do
     --ctrace) myOptions[CommandTrace]="true"; shift 1;;
     --create) myOptions[Create]="true"; shift 1;;
     --delete) myOptions[Delete]="true"; shift 1;;
+    --addvar) myOptions[AddVar]="$2"; shift 1;;
     -f|--fields) myOptions[Fields]="$2"; shift 2;;
     --file) myOptions[File]="$2"; shift 2;;
     -j|--jq) myOptions[MoreJQ]="$2"; shift 2;;
@@ -439,6 +440,21 @@ do_apply() {
   do_api_post system applyconfig
 }
 
+### curl -XPUT "http://X.X.X.X/nagiosxi/api/v1/config/host/$x?apikey=KEY&pretty=1&old_host_name=testapihost&_foo=bartoo"
+# If we used --addvar then we want to add a custom macro to a host.  Other options available later
+if [ -n "${myOptions[AddVar]}" ]; then
+  if [ -z "${myDir[host_name]}" ]; then
+    echo "If using --addvar then you must specify -h for the host to add to"
+    exit 1
+  fi
+  hname=`echo "${myDir[host_name]}" | tr " " "+"`
+  varName=`echo "${myOptions[AddVar]}" | cut -d= -f 1 | tr " " "+" | sed -e "s/^_//"`
+  varVal=`echo "${myOptions[AddVar]}" | cut -d= -f 2 | tr " " "+"`
+  do_debug 1 "varName=$varName varVal=$varVal"
+  do_api_put config "host/$hname" "_${varName}=${varVal}"
+  exit
+fi
+
 # If we said "--create" then we want to make something
 if [ -n "${myOptions[Create]}" ]; then
   do_create