diff --git a/common/forth_namespace_tests.fs b/common/forth_namespace_tests.fs
index fb0c55b..676c73a 100644
--- a/common/forth_namespace_tests.fs
+++ b/common/forth_namespace_tests.fs
@@ -680,6 +680,9 @@ e: check-esp32-builtins
   check-files-dir-reverse
   out: dacWrite 
   out: MDNS.begin 
+  out: MDNS.addService 
+  out: MDNS.setInstanceName 
+  out: MDNS.addServiceTxt 
 ;e
 
 e: check-esp32-bindings
diff --git a/esp32/builtins.h b/esp32/builtins.h
index e7d451c..d3fb2ab 100644
--- a/esp32/builtins.h
+++ b/esp32/builtins.h
@@ -451,5 +451,9 @@ static cell_t FromIP(IPAddress ip) {
 # endif
 # define OPTIONAL_MDNS_SUPPORT \
   /* mDNS */ \
-  X("MDNS.begin", MDNS_BEGIN, n0 = MDNS.begin(c0))
+  X("MDNS.begin", MDNS_BEGIN, n0 = MDNS.begin(c0)) \
+  X("MDNS.addService", MDNS_ADD_SERVICE, n0 = MDNS.addService(c2, c1, n0); NIPn(2)) \
+  X("MDNS.setInstanceName", MDNS_SET_INSTANCE_NAME, MDNS.setInstanceName(c0); DROP) \
+  X("MDNS.addServiceTxt", MDNS_ADD_SERVICE_TXT, MDNS.addServiceTxt(c3, c2, c1, c0); DROPn(4))
+  /* alx */
 #endif