diff --git a/index.md b/index.md
index a2988695e6913aa1302aa61cf4f6f5907bab7397..d92de186bbe5fde06af0929ea145a2b2c8f4dc16 100644
--- a/index.md
+++ b/index.md
@@ -8,6 +8,8 @@ nav_order: 1
 
 ## [Camera sensors]({{ '/01_cameras.html' | relative_url }})
 
+Sensor basics
+
 ## [Passive scanning]({{ '/02_passive.html' | relative_url }})
 
 ## [Active scanning]({{ '/03_active.html' | relative_url }})