Small bug fix

category.go

@@ -13,7 +13,7 @@ type Category struct {
 	Label  string `xml:"label,attr,omitempty"`
 }
 
-// NewCategory creates a new Category. It returns a *Category and an error.
+// NewCategory creates a new Category. It returns a *Category.
 func NewCategory(term string) *Category {
 	return &Category{Term: term}
 }