diff --git a/apptax/admin/admin_view.py b/apptax/admin/admin_view.py
index 6b8fc138..1c954cba 100644
--- a/apptax/admin/admin_view.py
+++ b/apptax/admin/admin_view.py
@@ -50,6 +50,7 @@
 from apptax.admin.utils import taxref_media_file_name, get_user_permission
 from pypnusershub.utils import get_current_app_id
 from apptax.admin.admin import adresses
+from apptax.admin.utils import PopulateBibListeException, populate_bib_liste
 
 
 class FlaskAdminProtectedMixin:
@@ -136,7 +137,7 @@ def render(self, template, **kwargs):
 class PopulateBibListesForm(Form):
     delimiter = SelectField(label="Delimiter", choices=[(",", ","), (";", ";")])
     with_header = BooleanField(label="With header")
-    upload = FileUploadField("File")
+    upload = FileUploadField(label="File", allowed_extensions=("csv",))
 
 
 class BibListesView(FlaskAdminProtectedMixin, ModelView):
@@ -172,24 +173,12 @@ def import_cd_nom_view(self, *args, **kwargs):
             with_header = request.form.get("with_header", default=False)
             file = request.files["upload"]
 
-            fstring = file.read().decode()
-            inputcsv = csv.reader(fstring.splitlines(), delimiter=delimiter)
-
-            bibliste = BibListes.query.get(id_list)
-            # if header skip first line
-            if with_header:
-                next(inputcsv, None)
-            for row in inputcsv:
-                try:
-                    cd_nom = int(row[0])
-                except (TypeError, ValueError):
-                    flash(f"Invalid cd_nom value: {row[0]}")
-                    return self.render("admin/populate_biblist.html", form=form)
-                tax = Taxref.query.get(cd_nom)
-                if tax:
-                    tax.liste.append(bibliste)
-
-            db.session.commit()
+            try:
+                populate_bib_liste(id_list, delimiter, with_header, file)
+            except PopulateBibListeException as e:
+                flash(e.message, "error")
+                return self.render("admin/populate_biblist.html", form=form)
+
             return redirect(self.get_url(".index_view"))
 
         return self.render("admin/populate_biblist.html", form=form)
diff --git a/apptax/admin/templates/admin/populate_biblist.html b/apptax/admin/templates/admin/populate_biblist.html
index 8a1868d7..f4308ec5 100644
--- a/apptax/admin/templates/admin/populate_biblist.html
+++ b/apptax/admin/templates/admin/populate_biblist.html
@@ -6,12 +6,39 @@
     {{ super() }}
   {% endblock %}
 
-  <h1>Populate bib list</h1>
+  <h1>Peupler la liste</h1>
+
+  <div class="bg-light border p-3 mb-3">
+    <b>Instructions</b>
+    <p>
+      Pour ajouter des cd_nom à une liste, il faut avoir un fichier csv contenant une colonne.
+      Cette colonne doit correspondre à une liste de cd_nom
+    </p>
+
+    <div class="table-responsive col-4">
+      <table class="table table-sm table-striped table-bordered">
+        <thead>
+            <tr>
+              <th>cd_nom</th>
+              <th>autres colonnes facultatives et non utilisées</th>
+            </tr>
+        </thead>
+        <tbody>
+            <tr>
+              <td>212</td>
+              <td>...</td>
+            </tr>
+        </tbody>
+      </table>
+    </div>
+  </div>
+  <div class="border  p-3 mt-3">
   {% block edit_form %}
     {% call lib.form_tag(action=action) %}
       {{ lib.render_form_fields(form, form_opts=form_opts) }}
       {{ lib.render_form_buttons(cancel_url, extra, is_modal) }}
     {% endcall %}
   {% endblock %}
+  </div>
 
 {% endblock %}
diff --git a/apptax/admin/utils.py b/apptax/admin/utils.py
index d4b00ae7..f69c2a6f 100644
--- a/apptax/admin/utils.py
+++ b/apptax/admin/utils.py
@@ -1,8 +1,12 @@
+import csv
 from werkzeug.utils import secure_filename
 
 from pypnusershub.db.models import AppUser, Application
 from pypnusershub.utils import get_current_app_id
 
+from apptax.taxonomie.models import BibListes, Taxref
+from apptax.database import db
+
 
 def taxref_media_file_name(obj, file_data):
     """
@@ -24,3 +28,46 @@ def get_user_permission(id_role):
         AppUser.id_role == id_role
     )
     return query.scalar()
+
+
+class PopulateBibListeException(Exception):
+    def __init__(self, message):
+        self.message = message
+
+    def __str__(self):
+        return self.message
+
+
+def populate_bib_liste(id_list, delimiter, with_header, file):
+    if not ("." in file.filename and file.filename.rsplit(".", 1)[1].lower() == "csv"):
+        raise PopulateBibListeException("Format de fichier requis : CSV")
+
+    try:
+        fstring = file.read().decode()
+        inputcsv = csv.reader(fstring.splitlines(), delimiter=delimiter)
+    except Exception:
+        raise PopulateBibListeException("Lecture du fichier impossible")
+
+    bibliste = BibListes.query.get(id_list)
+
+    # if header skip first line
+    if with_header:
+        next(inputcsv, None)
+
+    for row in inputcsv:
+        try:
+            cd_nom = int(row[0])
+        except (TypeError, ValueError):
+            msg = "Invalid cd_nom value: {row[0]}"
+            if not row[0].isnumeric():
+                msg = """
+                    Il semble que votre fichier contienent le nom des colonnes,
+                    sélectionner l'option 'with header'
+                    ou que la première colonne ne corresponde pas à une liste de cd_nom"""
+            raise PopulateBibListeException(msg)
+
+        tax = Taxref.query.get(cd_nom)
+        if tax:
+            tax.liste.append(bibliste)
+
+    db.session.commit()