diff --git a/modules/35-interfaces/20-interface-using/index.ts b/modules/35-interfaces/20-interface-using/index.ts
index 3ebc680..b836d7d 100644
--- a/modules/35-interfaces/20-interface-using/index.ts
+++ b/modules/35-interfaces/20-interface-using/index.ts
@@ -11,11 +11,11 @@ interface IPlane extends IFlying {
 }
 
 // BEGIN
-interface ISuperman extends IBird, IPlane {
+interface ISuperMan extends IBird, IPlane {
   guessWho: (guess: string) => string;
 }
 
-const superMan: ISuperman = {
+const superMan: ISuperMan = {
   canFly: true,
   isLiving: true,
   canCarryPeople: true,
@@ -26,4 +26,4 @@ const superMan: ISuperman = {
 };
 // END
 
-export { superMan, type ISuperman, type IBird, type IPlane };
+export { superMan, type ISuperMan, type IBird, type IPlane };