diff --git a/docs/marks.md b/docs/marks.md
index f136e64..0bd1c97 100644
--- a/docs/marks.md
+++ b/docs/marks.md
@@ -19,7 +19,7 @@ different way in a UI.
 ```go
 // Use a named type for all marks, for namespacing purposes.
 type fromConfigType int
-val fromConfig fromConfigType
+var fromConfig fromConfigType
 
 return val.Mark(fromConfig)
 ```