diff --git a/docs/frameworks/mbed_extra.rst b/docs/frameworks/mbed_extra.rst
index 721402e1..2e252508 100644
--- a/docs/frameworks/mbed_extra.rst
+++ b/docs/frameworks/mbed_extra.rst
@@ -13,7 +13,6 @@ Articles
 --------
 
 * Dec 15, 2015 - **stastaka** - `PlatformIOでカスタムボードを使う (Use a custom board for PlatformIO, Japanese) <http://qiita.com/stastaka/items/a6a50dbbb2933bd78bdd>`_
-http://congdegnu.es/2015/11/09/programar-con-arduino-the-good-way/>`_
 * Nov 06, 2015 - **nocd5** - `PlatformIOでmbedをオフラインビルドしSTM32 Nucleoボードでmrubyを使う (Use mruby in the offline build for STM32 Nucleo board with mbed and PlatformIO, Japanese) <http://qiita.com/nocd5/items/d5fda776240f7e7c17eb>`_
 * Oct 21, 2015 - **Vittorio Zaccaria** - `Using a cheap STM32 Nucleo to teach remote sensor monitoring <http://www.vittoriozaccaria.net/blog/2015/10/21/using-a-cheap-stm32-nucleo-to-teach-remote-sensor-monitoring.html>`_
 * Sep 01, 2015 - **Thomas P. Weldon, Ph.D.** - `Improvised MBED FRDM-K64F Eclipse/PlatformIO Setup and Software Installation <http://thomasweldon.com/tpw/courses/embeddsp/p00pcFrdmK64_eclipsePlatformioSetup.html>`_