diff --git a/doc/book/src/user/security-warnings.md b/doc/book/src/user/security-warnings.md
index 3e81a8b10..63f050ce5 100644
--- a/doc/book/src/user/security-warnings.md
+++ b/doc/book/src/user/security-warnings.md
@@ -68,7 +68,7 @@ it is disabled. We do not recommend you enable it until it has undergone a
 security review.
 
 RPC Interface
----------------
+-------------
 
 Users should choose a strong RPC password. If no RPC username and password are
 set, zcashd will not start and will print an error message with a suggestion