diff --git a/content/pages/h&d/index.rst b/content/pages/h&d/index.rst
index 9a3598c..9ceb0bf 100644
--- a/content/pages/h&d/index.rst
+++ b/content/pages/h&d/index.rst
@@ -1,6 +1,24 @@
 hdsa2020 network imaginaries
 ############################
 
+2020/05/19, 10:30:54, +0900
+
+pre-researches
+
+http://www.cybersecurityguy.com/Building_a_Raspberry_Pi_Captive_Portal_Wi-Fi_Hotspot.pdf
+
+https://pimylifeup.com/raspberry-pi-captive-portal/
+
+https://github.com/nodogsplash/nodogsplash
+
+http://dev.wifidog.org/wiki/Screenshots
+
+https://nodogsplashdocs.readthedocs.io/en/stable/
+
+
+
+2020/05/19, 10:30:52, +0900
+
 `Open call <https://hackersanddesigners.nl/p/Open_Call!_HDSA2020:_Network_Imaginaries>`_
 
 hdsa2020 call-for form