diff --git a/docs/en/mavlink/security_hardening.md b/docs/en/mavlink/security_hardening.md
index 1cb984d4101..9dab2eddb5d 100644
--- a/docs/en/mavlink/security_hardening.md
+++ b/docs/en/mavlink/security_hardening.md
@@ -64,7 +64,7 @@ Signing can also be disabled by physically removing the key file from the SD car
 Provision the key before the vehicle is used on an untrusted link, not after.
 
 Until a key is provisioned there is nothing to authenticate against, so any peer that can reach a link can provision one.
-Only *changing* a key requires a signed message; setting the first one cannot, because no key exists yet.
+Only _changing_ a key requires a signed message; setting the first one cannot, because no key exists yet.
 A key installed by someone else locks out the legitimate ground station, and the recovery is to remove the key file from the SD card.
 :::