diff --git a/changelog.md b/changelog.md
index 6312d58b..91659dee 100644
--- a/changelog.md
+++ b/changelog.md
@@ -9,6 +9,10 @@ and (starting with v4.0.0) this project adheres to [Semantic Versioning](http://
 
 ## [Released](https://github.com/HumanCellAtlas/metadata-schema/)
 
+### [type/biomaterial/donor_organism.json - v16.4.0] - 2024-10-21
+### Added
+Added comorbidities field in the donor_organism Fix#1569
+
 ### [module/project/hca_bionetwork.json - v1.0.2] - 2024-10-14
 ### Added
 Added atlas names in hca_bionetwork
diff --git a/docs/jsonBrowser/type.md b/docs/jsonBrowser/type.md
index 632af46f..5a181e70 100644
--- a/docs/jsonBrowser/type.md
+++ b/docs/jsonBrowser/type.md
@@ -431,6 +431,7 @@ organism_age | Age of organism in Age units measured since birth. | string | no
 organism_age_unit | The unit in which Age is expressed. | object | no | [See module  time_unit_ontology](module.md#time-unit-ontology) | Age unit |  | 
 development_stage | A classification of the developmental stage of the organism. | object | yes | [See module  development_stage_ontology](module.md#development-stage-ontology) | Development stage |  | 
 diseases | Short description of known disease(s) of the organism. | array | no | [See module  disease_ontology](module.md#disease-ontology) | Known disease(s) |  | 
+comorbidities | Short description of comorbidity(-ies) or secondary disease(s) of the organism. | array | no | [See module  disease_ontology](module.md#disease-ontology) | Comorbidities |  | 
 death | Information about conditions of death of the organism. | object | no | [See module  death](module.md#death) | Death conditions |  | 
 familial_relationships | Information about other organisms related to this organism. | array | no | [See module  familial_relationship](module.md#familial-relationship) | Familial relationship |  | 
 medical_tests | Information about the medical tests of the organism. | object | no | [See module  medical_tests](module.md#medical-tests) | Medical tests |  | 
diff --git a/json_schema/type/biomaterial/donor_organism.json b/json_schema/type/biomaterial/donor_organism.json
index 8ba81c0f..1b63ceb0 100644
--- a/json_schema/type/biomaterial/donor_organism.json
+++ b/json_schema/type/biomaterial/donor_organism.json
@@ -117,6 +117,15 @@
             "user_friendly": "Known disease(s)",
             "guidelines": "Enter 'normal' if no known disease."
         },
+        "comorbidities": {
+            "description": "Short description of comorbidity(-ies) or secondary disease(s) of the organism.",
+            "type": "array",
+            "items": {
+                "$ref": "module/ontology/disease_ontology.json"
+	        },
+            "user_friendly": "Comorbidities",
+            "guidelines": "Primary disease should be described in Known diseases field. Leave empty if no comorbidities are known."
+        },
         "death": {
             "description": "Information about conditions of death of the organism.",
             "type": "object",
diff --git a/json_schema/versions.json b/json_schema/versions.json
index 9eb28328..bcd03b5f 100644
--- a/json_schema/versions.json
+++ b/json_schema/versions.json
@@ -1,5 +1,5 @@
 {
-    "last_update_date": "2024-10-14T10:11:29Z",
+    "last_update_date": "2024-10-21T12:21:40Z",
     "version_numbers": {
         "core": {
             "biomaterial": {
@@ -93,7 +93,7 @@
             "biomaterial": {
                 "cell_line": "16.0.0",
                 "cell_suspension": "14.0.0",
-                "donor_organism": "16.3.0",
+                "donor_organism": "16.4.0",
                 "imaged_specimen": "3.5.0",
                 "organoid": "11.5.0",
                 "specimen_from_organism": "10.9.0"