Comment extra in requestSync

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/ContactSyncAdapterService.java

@@ -100,6 +100,7 @@ public class ContactSyncAdapterService extends Service {
 
     public static void requestSync(Context context) {
         Bundle extras = new Bundle();
+        // no need to wait for internet connection!
         extras.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
         ContentResolver.requestSync(
                 new Account(context.getString(R.string.app_name), Constants.PACKAGE_NAME),