diff --git a/backend/src/routes/dossiers/dossiers.service.ts b/backend/src/routes/dossiers/dossiers.service.ts
index 59d9f47..abb47b6 100644
--- a/backend/src/routes/dossiers/dossiers.service.ts
+++ b/backend/src/routes/dossiers/dossiers.service.ts
@@ -42,12 +42,14 @@ export class DossiersService {
       relations: ['user'],
     });
     if (am?.user) {
+      const bio = am.biography;
       const dossier: DossierAmCompletDto = {
         numero_dossier: num,
         user: this.toDossierAmUserDto(am.user),
         numero_agrement: am.approval_number,
         nir: am.nir,
-        biographie: am.biography,
+        texte_motivation: bio,
+        biographie: bio,
         disponible: am.available,
         ville_residence: am.residence_city,
         date_agrement: am.agreement_date,
diff --git a/backend/src/routes/dossiers/dto/dossier-am-complet.dto.ts b/backend/src/routes/dossiers/dto/dossier-am-complet.dto.ts
index 0ddc8a1..e43b5c9 100644
--- a/backend/src/routes/dossiers/dto/dossier-am-complet.dto.ts
+++ b/backend/src/routes/dossiers/dto/dossier-am-complet.dto.ts
@@ -39,6 +39,9 @@ export class DossierAmCompletDto {
   numero_agrement?: string;
   @ApiProperty({ required: false })
   nir?: string;
+  /** Même contenu que biographie — alias pour aligner le front avec le dossier famille (texte_motivation). */
+  @ApiProperty({ required: false, description: 'Texte de présentation / motivation (alias biographie)' })
+  texte_motivation?: string;
   @ApiProperty({ required: false })
   biographie?: string;
   @ApiProperty({ required: false })