diff --git a/doc/Translate_ttl_to_spec.md b/doc/Translate_ttl_to_spec.md
index 8b09efe..8099c85 100644
--- a/doc/Translate_ttl_to_spec.md
+++ b/doc/Translate_ttl_to_spec.md
@@ -4,6 +4,7 @@
   - [**rdfs:domain**](#rdfsdomain)
     - [owner is **a** type](#owner-is-a-type)
     - [owner is a **owl:unionOf** types](#owner-is-a-owlunionof-types)
+  - [**rdfs:subClassOf**](#rdfssubclassof)
 - [Further infos](#further-infos)
   - [RDF/S](#rdfs)
     - [range (https://www.w3.org/TR/rdf12-schema/#ch\_range)](#range-httpswwww3orgtrrdf12-schemach_range)
@@ -85,10 +86,10 @@ as:id rdfs:domain [owl:unionOf (as:Link as:Object)]
 
 Maps to
 ```clojure
-(s/def ::Object (s/keys :opt-un [::id ...]))
+(s/def ::Object (sh/map-spec (s/keys :opt-un [::id ...])))
 
 
-(s/def ::Link (s/keys :opt-un [::id]))
+(s/def ::Link (sh/map-spec (s/keys :opt-un [::id])))
 ```
 
 ## **rdfs:subClassOf**