diff --git a/config/config.example.json b/config/config.example.json
new file mode 100644
index 000000000..d160714af
--- /dev/null
+++ b/config/config.example.json
@@ -0,0 +1,14 @@
+/**
+ * Application config.
+ *
+ * You can create your own environment files such as "config.prod.json" and "config.dev.json"
+ * to override some values. The values will be merged, so you don't need to duplicate everything
+ * in this file.
+ */
+
+{
+    // @todo This could be read from package.json.
+    "versionname": "3.9.3-dev",
+    // Override default language here.
+    "default_lang": "es"
+}
diff --git a/config/config.json b/config/config.json
index 158bbf7f7..601928dfa 100644
--- a/config/config.json
+++ b/config/config.json
@@ -1,19 +1,8 @@
-/**
- * Application config.
- *
- * You can create your own environment files such as "config.prod.json" and "config.dev.json"
- * to override some values. The values will be merged, so you don't need to duplicate everything
- * in this file.
- */
-
 {
     "app_id": "com.moodle.moodlemobile",
     "appname": "Moodle Mobile",
     "versioncode": 3930,
-
-    // @todo This could be read from package.json.
     "versionname": "3.9.3-dev",
-
     "cache_update_frequency_usually": 420000,
     "cache_update_frequency_often": 1200000,
     "cache_update_frequency_sometimes": 3600000,