diff --git a/cores/esp8266/LwipDhcpServer.cpp b/cores/esp8266/LwipDhcpServer.cpp
index 07270bb6c2..5cf9e470eb 100644
--- a/cores/esp8266/LwipDhcpServer.cpp
+++ b/cores/esp8266/LwipDhcpServer.cpp
@@ -373,6 +373,21 @@ uint8_t* DhcpServer::add_msg_type(uint8_t* optptr, uint8_t type)
     *optptr++ = type;
     return optptr;
 }
+
+extern "C" uint8_t* __add_custom_offer_options(uint8_t *optptr)
+{
+    //  Example showing how to add Captive Portal Option to DHCP Server
+    //  *optptr++ = 114;
+    //  *optptr++ = 19;
+    //  char captive_uri[] = "http://192.168.4.1/";
+    //  for(int i = 0; i<19; i++){
+    //  *optptr++ = captive_uri[i];
+    //  }
+
+    return optptr; //do nothing by default. Libraries can then redefine this weak function in order to hook into DHCP server options
+}
+extern "C" uint8_t* add_custom_offer_options(uint8_t *optptr) __attribute__((weak, alias("__add_custom_offer_options")));
+
 ///////////////////////////////////////////////////////////////////////////////////
 /*
     DHCP msg offer
@@ -475,6 +490,8 @@ uint8_t* DhcpServer::add_offer_options(uint8_t* optptr)
     *optptr++ = 2;
 #endif
 
+    optptr = add_custom_offer_options(optptr); //this allows external code to redefine this weak function and hook into DHCP Offer.
+
     return optptr;
 
 #undef ipadd