diff --git a/mon-entreprise/source/locales/ui-en.yaml b/mon-entreprise/source/locales/ui-en.yaml
index 3cb42db84..90b51bdcf 100644
--- a/mon-entreprise/source/locales/ui-en.yaml
+++ b/mon-entreprise/source/locales/ui-en.yaml
@@ -1270,6 +1270,9 @@ pages:
       shortname: Midwife
       title: Income simulator for private midwives
     salarié:
+      alt-image1: Net salary (received by the employee) = Gross salary (written in the
+        employment contract) - employee contributions (pension, social security,
+        etc.)
       explication seo: <0>Calculate your net salary</0><1>During the job interview,
         the employer usually offers a "gross" remuneration. The announced amount
         thus includes employee contributions, which are used to finance the
diff --git a/mon-entreprise/source/pages/Simulateurs/metadata.tsx b/mon-entreprise/source/pages/Simulateurs/metadata.tsx
index d63f61550..5db9ca817 100644
--- a/mon-entreprise/source/pages/Simulateurs/metadata.tsx
+++ b/mon-entreprise/source/pages/Simulateurs/metadata.tsx
@@ -157,6 +157,10 @@ export function getSimulatorsData({
 								? urlIllustrationNetBrut
 								: urlIllustrationNetBrutEn
 						}
+						alt={t(
+							'pages.simulateurs.salarié.alt-image1',
+							'Salaire net (perçu par le salarié) = Salaire brut (inscrit dans le contrat de travail) - cotisations salariales (retraite, csg, etc)'
+						)}
 						css={`
 							width: 100%;
 						`}