From b933e3d2834e816493911647e159d6eda439f0d7 Mon Sep 17 00:00:00 2001
From: david gauchard <gauchard@laas.fr>
Date: Sun, 18 Apr 2021 09:15:42 +0200
Subject: [PATCH] WiFi off a boot: document a linker error when user wants to
 use wifi without including ESP8266WiFi.h (#7990)

---
 doc/esp8266wifi/generic-class.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/doc/esp8266wifi/generic-class.rst b/doc/esp8266wifi/generic-class.rst
index bf6228d4e..58e1fba3c 100644
--- a/doc/esp8266wifi/generic-class.rst
+++ b/doc/esp8266wifi/generic-class.rst
@@ -61,6 +61,8 @@ linker).
 
 .. code:: cpp
 
+    #include <ESP8266WiFi.h>    // necessary to avoid a linker error
+
     void setup () {
     #ifdef WIFI_IS_OFF_AT_BOOT
         enableWiFiAtBootTime(); // can be called from anywhere with the same effect