diff --git a/lacommunaute/forum/forms.py b/lacommunaute/forum/forms.py
index f4ed7129..9288370e 100644
--- a/lacommunaute/forum/forms.py
+++ b/lacommunaute/forum/forms.py
@@ -32,7 +32,7 @@ class ForumForm(forms.ModelForm):
     )
     image = forms.ImageField(
         required=False,
-        label="Banniere de couverture",
+        label="Banniere de couverture, format 1200 x 630 pixels recommandé",
         widget=forms.FileInput(attrs={"accept": settings.SUPPORTED_IMAGE_FILE_TYPES.keys()}),
     )