diff --git a/index.md b/index.md
index d92de186bbe5fde06af0929ea145a2b2c8f4dc16..4ade3d7d1f4313c3f5f6853bb297145191e6284c 100644
--- a/index.md
+++ b/index.md
@@ -12,4 +12,8 @@ Sensor basics
 
 ## [Passive scanning]({{ '/02_passive.html' | relative_url }})
 
+Testing - Photogrammetry / Stereo Photogrammetry
+
 ## [Active scanning]({{ '/03_active.html' | relative_url }})
+
+Testing - Mechanical Methods / Light / Lasers