diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index e9a81821..0ca2dd01 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -1744,13 +1744,19 @@
 #define LWIP_SOCKET                     1
 #endif
 
-/* LWIP_SOCKET_SET_ERRNO==1: Set errno when socket functions cannot complete
+/** LWIP_SOCKET_SET_ERRNO==1: Set errno when socket functions cannot complete
  * successfully, as required by POSIX. Default is POSIX-compliant.
  */
 #if !defined LWIP_SOCKET_SET_ERRNO || defined __DOXYGEN__
 #define LWIP_SOCKET_SET_ERRNO           1
 #endif
 
+/** LWIP_PROVIDE_ERRNO==1: Let lwIP provide ERRNO values.
+ */
+#if !defined LWIP_PROVIDE_ERRNO || defined __DOXYGEN__
+#define LWIP_PROVIDE_ERRNO              0
+#endif
+
 /**
  * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names through defines.
  * LWIP_COMPAT_SOCKETS==2: Same as ==1 but correctly named functions are created.