diff --git a/index.js b/index.js
index 6693f0a..b30587e 100644
--- a/index.js
+++ b/index.js
@@ -65,6 +65,14 @@ const params = yargs
             .nargs('i', 0)
             .describe('i', 'Ignore delegated prefixes')
 
+            .alias('s', 'monitor-as')
+            .nargs('s', 1)
+            .describe('s', 'List of monitored ASes to be added for generic monitoring in options.monitorASns.')
+
+            .alias('m', 'monitor-as-origin')
+            .nargs('m', 0)
+            .describe('m', 'Automatically generate list of monitored ASes (options.monitorASns) from prefix origins.')
+
             .demandOption(['o']);
     })
     .example('$0 generate -a 2914 -o prefixes.yml', 'Generate prefixes for AS2914')
@@ -77,8 +85,9 @@ const params = yargs
 
 switch(params._[0]) {
     case "generate":
-        const generatePrefixes = require("./generatePrefixesList");
+        const generatePrefixes = require("./src/generatePrefixesList");
         let prefixes = null;
+        let monitoredASes = false;
         if (params.pf) {
             throw new Error("The argument --pf has been deprecated. Use -l instead");
         }
@@ -94,12 +103,21 @@ switch(params._[0]) {
             }
         }
 
+        if (params.s && params.m) {
+            throw new Error("You can specify -s or -m, not both");
+        } else if (params.s) {
+            monitoredASes = (params.s || "").split(",");
+        } else if (params.m) {
+            monitoredASes = true;
+        }
+
         generatePrefixes(
             (params.a) ? params.a.toString().split(",") : null,
             params.o,
             (params.e || "").split(","),
             params.i || false,
-            prefixes
+            prefixes,
+            monitoredASes
         );
 
         break;
diff --git a/src/generatePrefixesList.js b/src/generatePrefixesList.js
index 019e6a7..d4b2793 100644
--- a/src/generatePrefixesList.js
+++ b/src/generatePrefixesList.js
@@ -4,8 +4,9 @@ import yaml from "js-yaml";
 import fs from "fs";
 const batchPromises = require('batch-promises');
 
-module.exports = function generatePrefixes(asnList, outputFile, exclude, excludeDelegated, prefixes) {
+module.exports = function generatePrefixes(asnList, outputFile, exclude, excludeDelegated, prefixes, monitoredASes) {
     const generateList = {};
+    const allOrigins = {};
     let someNotValidatedPrefixes = false;
 
     if (!asnList && !prefixes) {
@@ -44,7 +45,7 @@ module.exports = function generatePrefixes(asnList, outputFile, exclude, exclude
     };
 
     const getAnnouncedMoreSpecifics = (prefix) => {
-        console.log("Processing " + prefix);
+        console.log("Generating monitoring rule for", prefix);
         const url = brembo.build("https://stat.ripe.net", {
             path: ["data", "related-prefixes", "data.json"],
             params: {
@@ -84,6 +85,10 @@ module.exports = function generatePrefixes(asnList, outputFile, exclude, exclude
                 if (asns.length) {
                     const origin = (asns && asns.length) ? asns : [asn];
 
+                    for (let o of origin) {
+                        allOrigins[o] = true;
+                    }
+
                     generateList[prefix] = {
                         description: description || "No description provided",
                         asn: origin.map(i => parseInt(i)),
@@ -183,13 +188,32 @@ module.exports = function generatePrefixes(asnList, outputFile, exclude, exclude
                     console.log("Cannot download more specific prefixes", e);
                 })
         })
-        .then(() => {
+        .then(() => { // Check
             return Promise.all(Object.keys(generateList).map(prefix => validatePrefix(generateList[prefix].asn[0], prefix)))
                 .catch((e) => {
                     console.log("ROA check failed due to error", e);
                 })
         })
-        .then(() => {
+        .then(() => { // Add the options for monitorASns
+
+            const generateMonitoredAsObject = function (list) {
+                generateList.options = generateList.options || {};
+                generateList.options.monitorASns = generateList.options.monitorASns || {};
+                for (let monitoredAs of list) {
+                    console.log("Generating generic monitoring rule for AS", monitoredAs);
+                    generateList.options.monitorASns[monitoredAs] = {
+                        group: 'default'
+                    };
+                }
+            };
+            if (monitoredASes === true) {
+                generateMonitoredAsObject(Object.keys(allOrigins));
+            } else if (monitoredASes.length) {
+                generateMonitoredAsObject(monitoredASes);
+            }
+            // Otherwise nothing
+        })
+        .then(() => { // write everything into the file
             const yamlContent = yaml.dump(generateList);
             fs.writeFileSync(outputFile, yamlContent);