diff --git a/README.md b/README.md
index 295ea337..86a8a8bd 100644
--- a/README.md
+++ b/README.md
@@ -145,6 +145,11 @@ build latest pre_build bin.
 #define LUA_USE_MODULES_CJSON
 #endif /* LUA_USE_MODULES */
 ```
+#Online firmware custom build
+
+For many application, some modules are not used, remove them can free many memory.<br />
+
+Please try Marcel's [NodeMCU custom builds](http://frightanic.com/nodemcu-custom-build) cloud service and you can get your own firmware.<br />
 
 #Flash the firmware
 nodemcu_latest.bin: 0x00000<br />