diff --git a/README.md b/README.md
index fafcded..69984cc 100644
--- a/README.md
+++ b/README.md
@@ -86,3 +86,7 @@ WOL ENV:
 * WOL_API = IP of docker host
 * WOL_API_PORT= port wol_api is running on
 * WOL_WAIT= time in seconds to wait for host to wake
+* WOL_NATIVE_HOST = IP of NAT gateway with forwarded port for WoL *
+* WOL_NATIVE_PORT = External port on gateway for forwarding. Ensure that it is mapped to your target machine IP on port 9. *
+
+*Optional. Only applicable when not using the WoL docker service API and when waking from outside NAT is required. Omit, or leave blank otherwise.
diff --git a/root/usr/local/bin/wol_rffmpeg/wol b/root/usr/local/bin/wol_rffmpeg/wol
index 895fc9d..019f77f 100755
--- a/root/usr/local/bin/wol_rffmpeg/wol
+++ b/root/usr/local/bin/wol_rffmpeg/wol
@@ -14,8 +14,15 @@ if [ $RFFMPEG_WOL == "native" ] && [ ! -z $RFFMPEG_HOST ] && [ ! -z $RFFMPEG_HOS
 then
         echo WOL enabled
         echo "$RFFMPEG_HOST" is down, sending wakeup to "$mac"
-        wakeonlan $mac
-        #wakeonlan -i $RFFMPEG_HOST $mac
+
+        WOL_OPTIONS=""
+        if [ ! -z $WOL_NATIVE_HOST ]; then
+            WOL_OPTIONS="$WOL_OPTIONS -i $WOL_NATIVE_HOST"
+        fi
+        if [ ! -z $WOL_NATIVE_PORT ]; then
+            WOL_OPTIONS="$WOL_OPTIONS -p $WOL_NATIVE_PORT"
+        fi
+        wakeonlan $WOL_OPTIONS $mac
         echo "waiting $WOL_WAIT seconds for $RFFMPEG_HOST to wake"
         sleep $WOL_WAIT
 fi