diff --git a/srcs/requirements/nestjs/api_back/src/users/dto/create-users.dto.ts b/srcs/requirements/nestjs/api_back/src/users/dto/create-users.dto.ts
index 8b1a2529..9b61c95a 100644
--- a/srcs/requirements/nestjs/api_back/src/users/dto/create-users.dto.ts
+++ b/srcs/requirements/nestjs/api_back/src/users/dto/create-users.dto.ts
@@ -1,10 +1,11 @@
-import { IsBoolean, Matches,  IsEmail, IsNotEmpty, IsOptional, IsString } from 'class-validator';
+import { IsBoolean, Matches, MaxLength,  IsEmail, IsNotEmpty, IsOptional, IsString } from 'class-validator';
 import { isSet } from 'util/types';
 
 export class CreateUsersDto {
 	@IsString()
 	@IsNotEmpty()
 	@Matches(/^[a-zA-Z0-9'-_]+$/)
+	@MaxLength(50)
 	readonly username: string;
 	readonly fortyTwoId: string;
 	@IsEmail()
diff --git a/srcs/requirements/svelte/api_front/src/pages/profile/ProfileSettings.svelte b/srcs/requirements/svelte/api_front/src/pages/profile/ProfileSettings.svelte
index f4fa2699..a5058dee 100644
--- a/srcs/requirements/svelte/api_front/src/pages/profile/ProfileSettings.svelte
+++ b/srcs/requirements/svelte/api_front/src/pages/profile/ProfileSettings.svelte
@@ -51,7 +51,7 @@
 		.then((response) => {
 			if (!response.ok) {
 				success.username = ''
-				errors.username = "Use [a-zA-Z0-9] and - _ .";
+				errors.username = "Max length : 50 . Use [a-zA-Z0-9] and - _ .";
 				if (response.status === 409) {
 					errors.username = `${set.username} is already in use, pick a different one.`;
 				}