diff --git a/docs/migrations.rst b/docs/migrations.rst
index bd52196..101c7d5 100644
--- a/docs/migrations.rst
+++ b/docs/migrations.rst
@@ -16,7 +16,7 @@ NixOS 25.11
 This option was introduced in the NixOS 25.11 release cycle, in which case you
 can safely initialize its value at `1`.
 
-:: code-block: nix
+.. code-block:: nix
 
    mailserver.stateVersion = 1;