diff --git a/README.md b/README.md
index 91b2144..f349a49 100644
--- a/README.md
+++ b/README.md
@@ -460,6 +460,18 @@ To use PSRAM for internal memory allocation which you can config to use it via [
 #define ESP_GOOGLE_SHEET_CLIENT_USE_PSRAM
 ```
 
+### Usage with TinyGSM
+By default the library assumes a working native WiFi or Ethernet connection. When using TinyGSM as an external client, you most likely do not want to use the Wifi/Ethernet (i.e. to get the current time). You will have to disable this in [**ESP_Google_Sheet_Client_FS_Config.h**](src/ESP_Google_Sheet_Client_FS_Config.h) by uncommenting the following lines like this:
+```cpp
+/* If not use on-board WiFi */
+#define ESP_GOOGLE_SHEET_CLIENT_DISABLE_ONBOARD_WIFI
+
+/* If not use native Ethernet (Ethernet interfaces that supported by SDK) */
+#define ESP_GOOGLE_SHEET_CLIENT_DISABLE_NATIVE_ETHERNET
+```
+Also, check out the [GSM Example](examples/GSM/GSM.ino) for more information.
+
+
 ## Functions Description
 
 ### Global Functions
diff --git a/src/ESP_Google_Sheet_Client.cpp b/src/ESP_Google_Sheet_Client.cpp
index b34c50c..74a1da5 100644
--- a/src/ESP_Google_Sheet_Client.cpp
+++ b/src/ESP_Google_Sheet_Client.cpp
@@ -68,7 +68,7 @@ void GSheetClass::auth(const char *client_email, const char *project_id, const c
 #endif
     }
 
-#if defined(ESP32) || defined(ESP8266)
+#if defined(ESP_GOOGLE_SHEET_CLIENT_WIFI_IS_AVAILABLE)
     config.internal.reconnect_wifi = WiFi.getAutoReconnect();
 #endif
     config.signer.tokens.token_type = token_type_oauth2_access_token;