diff --git a/atst/domain/requests.py b/atst/domain/requests.py
index 47629ebc..808f2553 100644
--- a/atst/domain/requests.py
+++ b/atst/domain/requests.py
@@ -13,6 +13,7 @@ from atst.models.request import Request
 from atst.models.request_revision import RequestRevision
 from atst.models.request_status_event import RequestStatusEvent, RequestStatus
 from atst.models.request_review import RequestReview
+from atst.models.request_internal_comment import RequestInternalComment
 from atst.utils import deep_merge
 
 from .exceptions import NotFoundError, UnauthorizedError
@@ -311,3 +312,13 @@ WHERE requests_with_status.status = :status
             Requests.set_status(request, RequestStatus.CHANGES_REQUESTED_TO_FINVER)
 
         return Requests._add_review(user, request, review_data)
+
+    @classmethod
+    def update_internal_comments(cls, user, request, comment_text):
+        Authorization.check_can_approve_request(user)
+
+        request.internal_comments = RequestInternalComment(text=comment_text, user=user)
+        db.session.add(request)
+        db.session.commit()
+
+        return request
diff --git a/tests/domain/test_requests.py b/tests/domain/test_requests.py
index bb4d8949..c9f03d8e 100644
--- a/tests/domain/test_requests.py
+++ b/tests/domain/test_requests.py
@@ -221,3 +221,12 @@ def test_request_changes_to_financial_verification_info():
     assert request.status == RequestStatus.CHANGES_REQUESTED_TO_FINVER
     current_review = request.latest_status.review
     assert current_review.fname_mao == review_data["fname_mao"]
+
+
+def test_update_internal_comments():
+    request = RequestFactory.create()
+    ccpo = UserFactory.from_atat_role("ccpo")
+
+    request = Requests.update_internal_comments(ccpo, request, "this is my comment")
+
+    assert request.internal_comments.text == "this is my comment"