diff --git a/blog/posts/biometrics-explained.md b/blog/posts/biometrics-explained.md
index 56241b054b..3cf3a3cd66 100644
--- a/blog/posts/biometrics-explained.md
+++ b/blog/posts/biometrics-explained.md
@@ -20,4 +20,8 @@ One of the most recognizable types of biometric authentication has to be the fin
 
 1. It's theorized that the reason humans have fingerprints in the first place is to [enhance our sense of touch](https://www.science.org/doi/10.1126/science.1166467).
 
+There four main ways we accomplish this: optical sensors, capacitive sensors, ultrasonic sensors, and thermal sensors.
+
+### Optical Fingerprint Sensors
+