diff --git a/backend/services/auth-service/src/interface/http/dto/login.dto.ts b/backend/services/auth-service/src/interface/http/dto/login.dto.ts
index c9d6f82..72a6db8 100644
--- a/backend/services/auth-service/src/interface/http/dto/login.dto.ts
+++ b/backend/services/auth-service/src/interface/http/dto/login.dto.ts
@@ -1,4 +1,4 @@
-import { IsString, MinLength } from 'class-validator';
+import { IsString, IsOptional, MinLength } from 'class-validator';
 import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
 
 export class LoginDto {
@@ -12,7 +12,12 @@ export class LoginDto {
   password: string;
 
   @ApiPropertyOptional({ description: 'Device info for token tracking' })
+  @IsOptional()
   @IsString()
-  @MinLength(0)
   deviceInfo?: string;
+
+  @ApiPropertyOptional({ description: 'Client IP address' })
+  @IsOptional()
+  @IsString()
+  ipAddress?: string;
 }