blog post updated for 1951 layout, #728, metanorma/metanorma-iso#1089

_posts/2024-03-20-iso-old-layouts.adoc

@@ -48,6 +48,12 @@ Note: The layout `2012` is similar to `1989`, but with changed logo in mid-2012.
 
 == Layout 1951 features
 
+Initially the ISO published the 'recommendation' instead of 'international standard' as currently.
+Therefore, the document attribute `:doctype:` should be set to the value `recommendation`:
+```
+:doctype: recommendation
+```
+
 The last page provides the 'Date of the first printing' and 'Price'. You can set these data by
 the document attributes `:presentation-metadata-first-printing-date:`, `:presentation-metadata-price:`, for instance:
 ```