diff --git a/app/views/puzzles/_form.html.slim b/app/views/puzzles/_form.html.slim
index 85c48ea..9fe9b8a 100644
--- a/app/views/puzzles/_form.html.slim
+++ b/app/views/puzzles/_form.html.slim
@@ -1,4 +1,7 @@
 = form_with model: puzzle, url: url, method: method do |form|
+  .row.mb-3
+    .col.alert.alert-warning
+      = t("puzzles.form.fake_data_recommendation")
   .row.mb-3
     .col
       .form-floating
diff --git a/config/locales/en.yml b/config/locales/en.yml
index ed0f727..ebaf11b 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -143,6 +143,8 @@ en:
   puzzles:
     edit:
       title: "Edit contest puzzle"
+    form:
+      fake_data_recommendation: It is recommended to first enter a fake name and image, and to use the real ones only once the contest starts.
     image_select: "Select an image"
     new:
       title: "New contest puzzle"
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index dcf0d81..69783a9 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -114,6 +114,8 @@ fr:
   puzzles:
     edit:
       title: "Modifier le puzzle"
+    form:
+      fake_data_recommendation: Il est recommendé d'entrer de faux noms et images, et de mettre les vrais uniquement quand le concours démarre.
     image_select: "Choisis une image"
     new:
       title: "Nouveau puzzle"