diff --git a/src/vin/__init__.py b/src/vin/__init__.py
index 9a95c94..f62ffac 100644
--- a/src/vin/__init__.py
+++ b/src/vin/__init__.py
@@ -95,14 +95,18 @@ def wmi(self) -> str:
         Mass-market manufacturers are assigned a three-character WMI. For
         example, some Honda cars have WMI 5FN:
 
+        .. code-block:: text
+
           5FNYF5H59HB011946
-          ---
+          ===
 
         Specialized manufacturers are assigned six-character WMI. For example,
         Koenigsegg cars have WMI YT9007:
 
+        .. code-block:: text
+
           YT9NN1U14KA007175
-          ---        ---
+          ===        ===
 
         Examples: