diff --git a/src/opportunities/dto.ts b/src/opportunities/dto.ts
index 35d4e34..5670aa6 100644
--- a/src/opportunities/dto.ts
+++ b/src/opportunities/dto.ts
@@ -1,4 +1,4 @@
-import { IsISO8601, IsNumber, IsOptional, IsString, Length, Max, Min } from 'class-validator';
+import { IsISO8601, IsInt, IsNumber, IsOptional, IsString, Length, Max, Min } from 'class-validator';
 
 export class CreateOpportunityDto {
   @IsString()
@@ -15,13 +15,15 @@ export class CreateOpportunityDto {
   @Length(1, 255)
   entityId?: string;
 
+  /** Valoarea minima estimata in minor units (ex: eurocenti). Trebuie sa fie integer. */
   @IsOptional()
-  @IsNumber()
+  @IsInt()
   @Min(0)
   valueRangeMin?: number;
 
+  /** Valoarea maxima estimata in minor units. Trebuie sa fie integer. */
   @IsOptional()
-  @IsNumber()
+  @IsInt()
   @Min(0)
   valueRangeMax?: number;
 
@@ -58,12 +60,12 @@ export class UpdateOpportunityDto {
   expiresAt?: string;
 
   @IsOptional()
-  @IsNumber()
+  @IsInt()
   @Min(0)
   valueRangeMin?: number;
 
   @IsOptional()
-  @IsNumber()
+  @IsInt()
   @Min(0)
   valueRangeMax?: number;
 }