diff --git a/app/api/formsemestres.py b/app/api/formsemestres.py
index e46258f2..24a98f33 100644
--- a/app/api/formsemestres.py
+++ b/app/api/formsemestres.py
@@ -33,6 +33,7 @@ from app.models import (
     Departement,
     Evaluation,
     FormSemestre,
+    FormSemestreDescription,
     FormSemestreEtape,
     FormSemestreInscription,
     Identite,
@@ -812,6 +813,30 @@ def formsemestre_get_description(formsemestre_id: int):
     return formsemestre.description.to_dict() if formsemestre.description else {}
 
 
+@bp.post("/formsemestre/<int:formsemestre_id>/description/edit")
+@api_web_bp.post("/formsemestre/<int:formsemestre_id>/description/edit")
+@login_required
+@scodoc
+@permission_required(Permission.ScoView)
+@as_json
+def formsemestre_edit_description(formsemestre_id: int):
+    """Modifie description externe du formsemestre
+
+    formsemestre_id : l'id du formsemestre
+
+    SAMPLES
+    -------
+    /formsemestre/<int:formsemestre_id>/description/edit;{""description"":""descriptif du semestre"", ""dispositif"":1}
+    """
+    formsemestre = FormSemestre.get_formsemestre(formsemestre_id)
+    args = request.get_json(force=True)  # may raise 400 Bad Request
+    if not formsemestre.description:
+        formsemestre.description = FormSemestreDescription()
+    formsemestre.description.from_dict(args)
+    db.session.commit()
+    return formsemestre.description.to_dict()
+
+
 @bp.route("/formsemestre/<int:formsemestre_id>/description/image")
 @api_web_bp.route("/formsemestre/<int:formsemestre_id>/description/image")
 @login_required
diff --git a/tests/api/test_api_formsemestre.py b/tests/api/test_api_formsemestre.py
index 23d55ccc..923f4c79 100644
--- a/tests/api/test_api_formsemestre.py
+++ b/tests/api/test_api_formsemestre.py
@@ -28,8 +28,10 @@ from tests.api.setup_test_api import (
     API_URL,
     CHECK_CERTIFICATE,
     GET,
+    POST,
     api_headers,
     api_admin_headers,
+    set_headers,
 )
 
 from tests.api.tools_test_api import (
@@ -780,3 +782,49 @@ def _compare_formsemestre_resultat(res: list[dict], ref: list[dict]):
             if "nbabs" in k:
                 continue
             assert res_d[k] == ref_d[k], f"values for key {k} differ."
+
+
+def test_formsemestre_description(api_admin_headers):
+    """
+    Test accès et modification de la description
+    """
+    set_headers(api_admin_headers)
+    formsemestre_id = 1
+    r = GET(f"/formsemestre/{formsemestre_id}")
+    assert "description" not in r
+    r = POST(
+        f"/formsemestre/{formsemestre_id}/description/edit",
+        data={
+            "description": "une description",
+            "horaire": "un horaire",
+            "salle": "une salle",
+            "dispositif": 1,
+            "wip": True,
+        },
+    )
+    assert r["description"] == "une description"
+    assert r["horaire"] == "un horaire"
+    assert r["salle"] == "une salle"
+    assert r["dispositif"] == 1
+    assert r["wip"] is True
+    r = GET(f"/formsemestre/{formsemestre_id}/description")
+    assert r["description"] == "une description"
+    assert r["horaire"] == "un horaire"
+    assert r["salle"] == "une salle"
+    assert r["dispositif"] == 1
+    assert r["wip"] is True
+    r = POST(
+        f"/formsemestre/{formsemestre_id}/description/edit",
+        data={
+            "description": "",
+            "horaire": "",
+            "salle": "",
+            "dispositif": 0,
+            "wip": False,
+        },
+    )
+    assert r["description"] == ""
+    assert r["horaire"] == ""
+    assert r["salle"] == ""
+    assert r["dispositif"] == 0
+    assert r["wip"] is False
diff --git a/tests/api/test_api_permissions.py b/tests/api/test_api_permissions.py
index ae3dad92..f94ce12e 100755
--- a/tests/api/test_api_permissions.py
+++ b/tests/api/test_api_permissions.py
@@ -100,7 +100,7 @@ def test_permissions(api_headers):
             verify=CHECK_CERTIFICATE,
             timeout=scu.SCO_TEST_API_TIMEOUT,
         )
-        assert r.status_code == 200
+        assert r.status_code // 100 == 2  # 2xx success
 
     # Même chose sans le jeton:
     for rule in api_rules: