diff --git a/stages/migrations/0023_course_public_length.py b/stages/migrations/0023_course_public_length.py
new file mode 100644
index 0000000..fb62657
--- /dev/null
+++ b/stages/migrations/0023_course_public_length.py
@@ -0,0 +1,16 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stages', '0022_corporation_unique_name_and_city'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='course',
+            name='public',
+            field=models.CharField(default='', max_length=100, verbose_name='Classe(s)'),
+        ),
+    ]
diff --git a/stages/models.py b/stages/models.py
index 60ab485..91ff786 100644
--- a/stages/models.py
+++ b/stages/models.py
@@ -381,7 +381,7 @@ class Course(models.Model):
     """Cours et mandats attribués aux enseignants"""
     teacher = models.ForeignKey(Teacher, blank=True, null=True,
         verbose_name="Enseignant-e", on_delete=models.SET_NULL)
-    public = models.CharField("Classe(s)", max_length=40, default='')
+    public = models.CharField("Classe(s)", max_length=100, default='')
     subject = models.CharField("Sujet", max_length=100, default='')
     period = models.IntegerField("Nb de périodes", default=0)
     # Imputation comptable: compte dans lequel les frais du cours seront imputés