diff --git a/docs/entityRelationshipDiagram.md b/docs/entityRelationshipDiagram.md
index 0e96d22bd..e7170bf79 100644
--- a/docs/entityRelationshipDiagram.md
+++ b/docs/entityRelationshipDiagram.md
@@ -107,10 +107,10 @@ 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