diff --git a/clusters/branded_vulnerability.json b/clusters/branded_vulnerability.json
index 72786cb9..ab15a1f3 100644
--- a/clusters/branded_vulnerability.json
+++ b/clusters/branded_vulnerability.json
@@ -2,6 +2,7 @@
   "authors": [
     "Unknown"
   ],
+  "category": "vulnerability",
   "description": "List of known vulnerabilities and attacks with a branding",
   "name": "Branded Vulnerability",
   "source": "Open Sources",
diff --git a/clusters/cert-eu-govsector.json b/clusters/cert-eu-govsector.json
index 9673709d..1405c134 100644
--- a/clusters/cert-eu-govsector.json
+++ b/clusters/cert-eu-govsector.json
@@ -2,6 +2,7 @@
   "authors": [
     "Various"
   ],
+  "category": "sector",
   "description": "Cert EU GovSector",
   "name": "Cert EU GovSector",
   "source": "CERT-EU",
diff --git a/clusters/mitre-attack-pattern.json b/clusters/mitre-attack-pattern.json
index 00209ab3..4b6dddf9 100644
--- a/clusters/mitre-attack-pattern.json
+++ b/clusters/mitre-attack-pattern.json
@@ -2,6 +2,7 @@
   "authors": [
     "MITRE"
   ],
+  "category": "attack-pattern",
   "description": "ATT&CK tactic",
   "name": "Attack Pattern",
   "source": "https://github.com/mitre/cti",
diff --git a/clusters/mitre-course-of-action.json b/clusters/mitre-course-of-action.json
index c8f97671..b3bcaf08 100644
--- a/clusters/mitre-course-of-action.json
+++ b/clusters/mitre-course-of-action.json
@@ -2,6 +2,7 @@
   "authors": [
     "MITRE"
   ],
+  "category": "course-of-action",
   "description": "ATT&CK Mitigation",
   "name": "Course of Action",
   "source": "https://github.com/mitre/cti",
diff --git a/clusters/mitre-enterprise-attack-attack-pattern.json b/clusters/mitre-enterprise-attack-attack-pattern.json
index 8e796643..06907aad 100644
--- a/clusters/mitre-enterprise-attack-attack-pattern.json
+++ b/clusters/mitre-enterprise-attack-attack-pattern.json
@@ -2,6 +2,7 @@
   "authors": [
     "MITRE"
   ],
+  "category": "attack-pattern",
   "description": "ATT&CK tactic",
   "name": "Enterprise Attack - Attack Pattern",
   "source": "https://github.com/mitre/cti",
diff --git a/clusters/mitre-enterprise-attack-course-of-action.json b/clusters/mitre-enterprise-attack-course-of-action.json
index 584f5d08..1057876b 100644
--- a/clusters/mitre-enterprise-attack-course-of-action.json
+++ b/clusters/mitre-enterprise-attack-course-of-action.json
@@ -2,6 +2,7 @@
   "authors": [
     "MITRE"
   ],
+  "category": "course-of-action",
   "description": "ATT&CK Mitigation",
   "name": "Enterprise Attack - Course of Action",
   "source": "https://github.com/mitre/cti",
diff --git a/clusters/mitre-mobile-attack-attack-pattern.json b/clusters/mitre-mobile-attack-attack-pattern.json
index 9f2b465d..a7fbc970 100644
--- a/clusters/mitre-mobile-attack-attack-pattern.json
+++ b/clusters/mitre-mobile-attack-attack-pattern.json
@@ -2,6 +2,7 @@
   "authors": [
     "MITRE"
   ],
+  "category": "attack-pattern",
   "description": "ATT&CK tactic",
   "name": "Mobile Attack - Attack Pattern",
   "source": "https://github.com/mitre/cti",
diff --git a/clusters/mitre-mobile-attack-course-of-action.json b/clusters/mitre-mobile-attack-course-of-action.json
index c0b32e7d..acccfb5a 100644
--- a/clusters/mitre-mobile-attack-course-of-action.json
+++ b/clusters/mitre-mobile-attack-course-of-action.json
@@ -2,6 +2,7 @@
   "authors": [
     "MITRE"
   ],
+  "category": "course-of-action",
   "description": "ATT&CK Mitigation",
   "name": "Mobile Attack - Course of Action",
   "source": "https://github.com/mitre/cti",
diff --git a/clusters/mitre-pre-attack-attack-pattern.json b/clusters/mitre-pre-attack-attack-pattern.json
index db225d93..f293b245 100644
--- a/clusters/mitre-pre-attack-attack-pattern.json
+++ b/clusters/mitre-pre-attack-attack-pattern.json
@@ -2,6 +2,7 @@
   "authors": [
     "MITRE"
   ],
+  "category": "attack-pattern",
   "description": "ATT&CK tactic",
   "name": "Pre Attack - Attack Pattern",
   "source": "https://github.com/mitre/cti",
diff --git a/clusters/preventive-measure.json b/clusters/preventive-measure.json
index 4dd6ba1d..4e6592b1 100644
--- a/clusters/preventive-measure.json
+++ b/clusters/preventive-measure.json
@@ -2,6 +2,7 @@
   "authors": [
     "Various"
   ],
+  "category": "measure",
   "description": "Preventive measures based on the ransomware document overview as published in https://docs.google.com/spreadsheets/d/1TWS238xacAto-fLKh1n5uTsdijWdCEsGIM0Y0Hvmc5g/pubhtml# . The preventive measures are quite generic and can fit any standard Windows infrastructure and their security measures.",
   "name": "Preventive Measure",
   "source": "MISP Project",
diff --git a/clusters/sector.json b/clusters/sector.json
index daf48a32..fb1ae99e 100644
--- a/clusters/sector.json
+++ b/clusters/sector.json
@@ -2,6 +2,7 @@
   "authors": [
     "Various"
   ],
+  "category": "sector",
   "description": "Activity sectors",
   "name": "Sector",
   "source": "CERT-EU",
diff --git a/schema_clusters.json b/schema_clusters.json
index 4cf095b4..7f785012 100644
--- a/schema_clusters.json
+++ b/schema_clusters.json
@@ -157,6 +157,7 @@
     "uuid",
     "values",
     "authors",
-    "source"
+    "source",
+    "category"
   ]
 }