diff --git a/config/ext-sample.js b/config/ext-sample.js
new file mode 100644
index 0000000..9386014
--- /dev/null
+++ b/config/ext-sample.js
@@ -0,0 +1,34 @@
+// This is an exmaple GenieACS extension to get the current latitude/longitude
+// of the International Space Station. Why, you ask? Because why not.
+// To install, copy this file to config/ext/iss.js.
+
+"use strict";
+
+const http = require("http");
+
+let cache = null;
+let cacheExpire = 0;
+
+function latlong(args, callback) {
+  if (Date.now() < cacheExpire)
+    return callback(null, cache);
+
+  http.get("http://api.open-notify.org/iss-now.json", (res) => {
+    if (res.statusCode !== 200)
+      return callback(new Error(`Request failed (status code: ${res.statusCode})`));
+
+    let rawData = "";
+    res.on("data", (chunk) => rawData += chunk);
+
+    res.on("end", () => {
+      let pos = JSON.parse(rawData)["iss_position"];
+      cache = [+pos["latitude"], +pos["longitude"]];
+      cacheExpire = Date.now() + 10000;
+      callback(null, cache);
+    });
+  }).on("error", (err) => {
+    callback(err);
+  });
+}
+
+exports.latlong = latlong;