diff --git a/content/notes/09-location-sensors-3.md b/content/notes/09-location-sensors-3.md
index 6cd14ffd6..d4e61b0af 100644
--- a/content/notes/09-location-sensors-3.md
+++ b/content/notes/09-location-sensors-3.md
@@ -5,6 +5,8 @@ tags:
 - info305
 ---
 
+in lecture angles vs distances used to compute location
+
 # Location Sensors - GPS (cont.)
 
 GPS - Receiver