diff --git a/docs/history/changelog.md b/docs/history/changelog.md
index abff6c18c..3a76d6bc6 100644
--- a/docs/history/changelog.md
+++ b/docs/history/changelog.md
@@ -192,10 +192,11 @@ Per the [normative and non-normative content and changes policy](https://docs.go
   * [#1380](https://github.com/open-contracting/standard/pull/1380) `Document.language` in favor of the new `Document.languages` field, to support documents in which multiple languages are used.
 
 * Update and clarify field descriptions:
-  * [#1094](https://github.com/open-contracting/standard/pull/1094) `Organization.id`, to clarify its uniqueness.
   * [#1113](https://github.com/open-contracting/standard/pull/1113) `ocid`, to recommend a hyphen after the ocid prefix.
-  * [#1167](https://github.com/open-contracting/standard/pull/1167) `Budget`,` Budget.id`, `Budget.description`, `Budget.amount`
-  * [#1189](https://github.com/open-contracting/standard/pull/1189) `Document.url`
+  * [#1094](https://github.com/open-contracting/standard/pull/1094) `Organization.id`, to clarify its uniqueness.
+  * [#1510](https://github.com/open-contracting/standard/pull/1510) `Organization.additionalIdentifiers`, to clarify its potential use for organizational units.
+  * [#1167](https://github.com/open-contracting/standard/pull/1167) `Budget`,` Budget.id`, `Budget.description`, `Budget.amount`, to reduce ambiguity and use consistent wording.
+  * [#1189](https://github.com/open-contracting/standard/pull/1189) `Document.url`, to use precise wording and to describe how to indicate a part of a document.
   * [#1229](https://github.com/open-contracting/standard/pull/1229) Standardize the descriptions of `planning.documents`, `tender.documents`, `awards.documents`, `contracts.documents`, and `contracts.implementation.documents`.
   * [#1335](https://github.com/open-contracting/standard/pull/1335) Standardize the descriptions of `planning`, `planning.rationale`, `planning.budget`, `planning.documents`, and `planning.milestones`.
 
diff --git a/schema/dereferenced-release-schema.json b/schema/dereferenced-release-schema.json
index 049bd102e..961f2b85f 100644
--- a/schema/dereferenced-release-schema.json
+++ b/schema/dereferenced-release-schema.json
@@ -174,7 +174,7 @@
           },
           "additionalIdentifiers": {
             "title": "Additional identifiers",
-            "description": "A list of additional / supplemental identifiers for the organization or participant, using the [organization identifier guidance](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/identifiers/). This can be used to provide an internally used identifier for this organization in addition to the primary legal entity identifier.",
+            "description": "Additional identifiers for this organization, following the [organization identifier guidance](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/identifiers/). This field can also be used to provide an identifier for an organizational unit (for example, an agency, branch or division).",
             "type": "array",
             "items": {
               "title": "Identifier",
@@ -33733,7 +33733,7 @@
         },
         "additionalIdentifiers": {
           "title": "Additional identifiers",
-          "description": "A list of additional / supplemental identifiers for the organization or participant, using the [organization identifier guidance](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/identifiers/). This can be used to provide an internally used identifier for this organization in addition to the primary legal entity identifier.",
+          "description": "Additional identifiers for this organization, following the [organization identifier guidance](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/identifiers/). This field can also be used to provide an identifier for an organizational unit (for example, an agency, branch or division).",
           "type": "array",
           "items": {
             "title": "Identifier",
diff --git a/schema/release-schema.json b/schema/release-schema.json
index a17bf6c2b..311a79294 100644
--- a/schema/release-schema.json
+++ b/schema/release-schema.json
@@ -1474,7 +1474,7 @@
         },
         "additionalIdentifiers": {
           "title": "Additional identifiers",
-          "description": "A list of additional / supplemental identifiers for the organization or participant, using the [organization identifier guidance](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/identifiers/). This can be used to provide an internally used identifier for this organization in addition to the primary legal entity identifier.",
+          "description": "Additional identifiers for this organization, following the [organization identifier guidance](https://standard.open-contracting.org/{{version}}/{{lang}}/schema/identifiers/). This field can also be used to provide an identifier for an organizational unit (for example, an agency, branch or division).",
           "type": "array",
           "items": {
             "$ref": "#/definitions/Identifier"