diff --git a/evolution/json.md b/evolution/json.md
index 0926460..cbb30dd 100644
--- a/evolution/json.md
+++ b/evolution/json.md
@@ -1,6 +1,11 @@
 # JSON Format Conventions
-Any JSON-based message **MUST** conform to the rules outlined in this section.
+Any JSON-based message **MUST** conform to these rules
 
 
-## Follow the Naming Conventions
-All JSON fields MUST follow the [Naming Conventions]() (use `snake_case`, US. English etc.)
\ No newline at end of file
+- All JSON field names **MUST** follow the [Naming Conventions](https://adidas-group.gitbooks.io/api-guidelines/content/evolution/naming-conventions.html) (`snake_case`, American English etc.)
+- Field names **MUST** be ASCII alpha num characters, underscore (`_`) or dollar sign (`$`)
+- Boolean fields **MUST NOT** be of `null` value
+- Fields with `null` value **SHOULD** be omitted
+- Empty arrays and objects **SHOULD NOT ** be `null` (use `[]` or `{}` instead)
+- Array field names **SHOULD** be plural (e.g. `"orders": []`)
+