diff --git a/blog/posts/biometrics-explained.md b/blog/posts/biometrics-explained.md
index 98dacab1a..56241b054 100644
--- a/blog/posts/biometrics-explained.md
+++ b/blog/posts/biometrics-explained.md
@@ -15,6 +15,9 @@ Biometrics are a convenient and secure way to authenticate our devices. Many of
 
 ## Fingerprint
 
-One of the most recognizable types of biometric authentication has to be the fingerprint reader. The idea is that everyone has a fairly unique fingerprint, so we should be able to distinguish between your fingerprint and someone else's reliably. { .annotate }
+One of the most recognizable types of biometric authentication has to be the fingerprint reader. The idea is that everyone has a fairly unique fingerprint, so we should be able to distinguish between your fingerprint and someone else's reliably. (1)
+{ .annotate }
+
+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).
+
 
-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).