diff --git a/types/cpan-definition.json b/types/cpan-definition.json
index 4c764d0f..3ba2424a 100644
--- a/types/cpan-definition.json
+++ b/types/cpan-definition.json
@@ -3,15 +3,19 @@
   "$id": "https://packageurl.org/types/cpan-definition.json",
   "type": "cpan",
   "type_name": "CPAN",
-  "description": "Perl package distributions published on CPAN",
+  "description": "Perl distributions (packages) published on CPAN",
   "repository": {
     "use_repository": true,
     "default_repository_url": "https://www.cpan.org/"
   },
   "namespace_definition": {
     "requirement": "required",
+    "case_sensitive": true,
     "native_name": "CPAN ID of the author/publisher",
     "note": "It MUST be written uppercase and is required"
+    "normalization_rules": [
+      "It must be uppercased."
+    ]
   },
   "name_definition": {
     "requirement": "required",