diff --git a/Arduino/McLighting/definitions.h b/Arduino/McLighting/definitions.h
index 7656030..2309066 100644
--- a/Arduino/McLighting/definitions.h
+++ b/Arduino/McLighting/definitions.h
@@ -7,8 +7,8 @@
 const char HOSTNAME[] = "ESP8266_01";   // Friedly hostname
 
 #define ENABLE_OTA    // If defined, enable Arduino OTA code.
-#define ENABLE_MQTT   // If defined, enable MQTT client code.
-// #define ENABLE_BUTTON  // If defined, enable button handling code.
+#define ENABLE_MQTT   // If defined, enable MQTT client code, see: https://github.com/toblum/McLighting/wiki/MQTT-API
+// #define ENABLE_BUTTON  // If defined, enable button handling code, see: https://github.com/toblum/McLighting/wiki/Button-control
 
 // parameters for automatically cycling favorite patterns
 uint32_t autoParams[][4] = {   // color, speed, mode, duration (seconds)