diff --git a/YubiKey-PIV-Card.md b/YubiKey-PIV-Card.md
index 73dfac8..4cd345f 100644
--- a/YubiKey-PIV-Card.md
+++ b/YubiKey-PIV-Card.md
@@ -19,5 +19,5 @@ Authenticates against physical access applications (e.g. door locks). By default
 Attests other slot keys were generated on the device.
 
 
-#### Reference
-https://ruimarinho.gitbooks.io/yubikey-handbook/content/piv/use-cases.html
+
+> https://ruimarinho.gitbooks.io/yubikey-handbook/content/piv/use-cases.html