Use bold instead of italics
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index 78bf663..e5d8c65 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -20,7 +20,7 @@
message but an attacker can create bogus messages and force the application to
decrypt them.
-For this reason it is *strongly* recommended to combine encryption with a
+For this reason it is **strongly** recommended to combine encryption with a
message authentication code, such as :doc:`HMAC </hazmat/primitives/mac/hmac>`, in
an "encrypt-then-MAC" formulation as `described by Colin Percival`_.