diff --git a/docs/entityRelationshipDiagram.md b/docs/entityRelationshipDiagram.md
index da5bf4b0d..f87b0c9b5 100644
--- a/docs/entityRelationshipDiagram.md
+++ b/docs/entityRelationshipDiagram.md
@@ -61,10 +61,10 @@ Cardinality is a property that describes how many elements of another entity can
 
 | Value (left) | Value (right) | Meaning                                                |
 |:------------:|:-------------:|--------------------------------------------------------|
-|     `|o`     |       `o|`    | Zero or one                                            |
-|     `||`     |       `||`    | Exactly one                                            |
+|     `\|o`    |       `o\|`   | Zero or one                                            |
+|     `\|\|`   |       `\|\|`  | Exactly one                                            |
 |     `}o`     |       `o{`    | Zero or more (no upper limit)                          |
-|     `}|`     |       `|{`    | One or more (no upper limit)                           |
+|     `}\|`    |       `\|{    | One or more (no upper limit)                           |
 
 ### Identification