diff --git a/openstreetmap.md b/openstreetmap.md
index 782dff5..8d9f1ed 100644
--- a/openstreetmap.md
+++ b/openstreetmap.md
@@ -1,104 +1,134 @@
+Untuk **ambil alamat dari longitude–latitude** itu namanya **reverse geocoding**.
+Ada beberapa cara, tergantung mau **pakai API online** atau **offline**.
 
 ---
 
-## ✅ Contoh dasar (JavaScript)
+## ✅ Cara PALING UMUM: Google Maps Reverse Geocoding
 
-```js
-async function getAlamat(lat, lng) {
-  const res = await fetch(
-    `https://nominatim.openstreetmap.org/reverse?lat=${lat}&lon=${lng}&format=json`
-  );
+### Contoh koordinat
 
-  if (!res.ok) {
-    throw new Error(`HTTP error! status: ${res.status}`);
-  }
-
-  const data = await res.json();
-  return data.display_name;
-}
-
-// pakai
-(async () => {
-  try {
-    const alamat = await getAlamat(-6.2, 106.816666);
-    console.log(alamat);
-  } catch (err) {
-    console.error(err);
-  }
-})();
+```
+lat = -6.200000
+lng = 106.816666
 ```
 
 ---
 
-## ✅ Dengan **Google Maps API**
+### 🔹 JavaScript (fetch)
 
 ```js
-async function getAlamatGoogle(lat, lng) {
-  const apiKey = "API_KEY_KAMU";
-  const url = `https://maps.googleapis.com/maps/api/geocode/json?latlng=${lat},${lng}&key=${apiKey}`;
+const lat = -6.2;
+const lng = 106.816666;
+const apiKey = "API_KEY_KAMU";
 
-  const res = await fetch(url);
-  const data = await res.json();
+fetch(`https://maps.googleapis.com/maps/api/geocode/json?latlng=${lat},${lng}&key=${apiKey}`)
+  .then(res => res.json())
+  .then(data => {
+    console.log(data.results[0].formatted_address);
+  });
+```
 
-  if (data.status !== "OK") {
-    throw new Error(data.status);
-  }
+📌 Output contoh:
 
-  return data.results[0].formatted_address;
+```
+Jakarta, Daerah Khusus Ibukota Jakarta, Indonesia
+```
+
+---
+
+### 🔹 Response penting dari Google
+
+```json
+{
+  "formatted_address": "Jl. MH Thamrin No.1, Jakarta Pusat, Indonesia",
+  "address_components": [
+    { "long_name": "Jakarta Pusat", "types": ["administrative_area_level_2"] }
+  ]
 }
 ```
 
 ---
 
-## ✅ Ambil field detail (jalan, kota, dll)
+## ✅ Alternatif GRATIS (tanpa API key): OpenStreetMap (Nominatim)
+
+⚠️ Ada rate limit (jangan spam)
+
+### JavaScript
 
 ```js
-async function getAlamatDetail(lat, lng) {
-  const res = await fetch(
-    `https://nominatim.openstreetmap.org/reverse?lat=${lat}&lon=${lng}&format=json`
-  );
-  const data = await res.json();
+fetch(`https://nominatim.openstreetmap.org/reverse?lat=-6.2&lon=106.816666&format=json`)
+  .then(res => res.json())
+  .then(data => {
+    console.log(data.display_name);
+  });
+```
 
-  const a = data.address;
-  return {
-    jalan: a.road,
-    kecamatan: a.suburb,
-    kota: a.city || a.town,
-    provinsi: a.state,
-    negara: a.country,
-    kodepos: a.postcode,
-  };
-}
+📌 Output:
+
+```
+Jakarta Pusat, DKI Jakarta, Indonesia
 ```
 
 ---
 
-## ⚠️ Best practice (penting)
+## ✅ Flutter (sering dipakai di mobile)
 
-### 🔹 Tambahkan User-Agent (wajib untuk OSM)
+### Pakai `geocoding` package
 
-```js
-fetch(url, {
-  headers: {
-    "User-Agent": "MyApp/1.0 (email@example.com)"
-  }
-});
+```dart
+import 'package:geocoding/geocoding.dart';
+
+List<Placemark> placemarks =
+    await placemarkFromCoordinates(-6.2, 106.816666);
+
+Placemark place = placemarks.first;
+
+print(place.street);
+print(place.locality);
+print(place.country);
 ```
 
-### 🔹 Hindari spam request
-
-* Cache hasil
-* Delay antar request
-
 ---
 
-## 🔥 Versi super ringkas
+## ✅ Golang (pakai OpenStreetMap)
 
-```js
-const alamat = await (
-  await fetch(`https://nominatim.openstreetmap.org/reverse?lat=-6.2&lon=106.816666&format=json`)
-).json();
+```go
+resp, _ := http.Get(
+  "https://nominatim.openstreetmap.org/reverse?lat=-6.2&lon=106.816666&format=json",
+)
+defer resp.Body.Close()
 
-console.log(alamat.display_name);
+var result map[string]interface{}
+json.NewDecoder(resp.Body).Decode(&result)
+
+fmt.Println(result["display_name"])
 ```
 
+---
+
+## ⚠️ Penting diketahui
+
+* Reverse geocoding **tidak 100% presisi**
+* Bisa beda hasil antar provider
+* Google = paling akurat, tapi **berbayar**
+* OSM = gratis, tapi **lebih lambat**
+
+---
+
+## 🔥 Mau hasil lebih detail?
+
+Kamu bisa ambil:
+
+* Jalan
+* Kecamatan
+* Kota
+* Provinsi
+* Kode pos
+
+Tinggal bilang:
+
+* **pakai bahasa apa** (JS / Flutter / Go)
+* **provider** (Google / OSM / Mapbox)
+* mau **online atau offline**
+
+Nanti aku bikinin contoh **siap copy–paste** 👍