diff --git a/docs/concept/concept.md b/docs/concept/concept.md
index 0bdaff7..9f88d2a 100644
--- a/docs/concept/concept.md
+++ b/docs/concept/concept.md
@@ -7,32 +7,3 @@ Most of these concepts and their terms will be pre-defined in all kinds of
 vocabularies but for brand-new use cases in a new domain concepts and their
 terms will have to be created.
 
-```mermaid
-classDiagram
-    direction RL
-    class Concept {
-        - type : ConceptType
-    }
-    class UseCase {
-        - vocabulary: Vocabulary
-        - stories: Story[]
-    }
-    UseCase --> UseCase : requires
-    Vocabulary "*" --> "*" Concept
-    Vocabulary "*" --> "*" Term
-    Story --> "*" Concept : input
-    Story --> "*" Concept : output
-    Term --> "1..*" Concept
-    %% Concept --> OntologyAxiom
-    Vocabulary <--> Concept
-    UseCase --> "1..*" Story
-    Persona --|> Concept
-    Concept --> Concept : broader
-    Concept --> Term : preferred
-    UseCase --> "1" Vocabulary : use case vocabulary
-    Persona "1" --o "0..*" Story
-    link UseCase "../use-case/"
-    link Story "../story/"
-    link Concept "../concept/"
-    link Persona "../persona/"
-```