diff --git a/src/timequiz.c b/src/timequiz.c
index c5edcd0..b7c29e9 100644
--- a/src/timequiz.c
+++ b/src/timequiz.c
@@ -12,6 +12,8 @@ void displayQuestion(char* question, char* answers[], int correctIndex);
 
 void processUserAnswer(int userAnswer, int correctIndex, int* score, int* totalCorrectAnswers, char* answers[]);
 
+int isValidAnswer(int userAnswer);
+
 void timequiz() {
 
     printf("Welcome to our Time Quiz!\n");
@@ -187,3 +189,6 @@ void processUserAnswer(int userAnswer, int correctIndex, int* score, int* totalC
         printf("Wrong! The correct answer is: %d. %s\n", correctIndex + 1, answers[correctIndex]);
     }
 }
+
+int isValidAnswer(int userAnswer) {
+}
diff --git a/src/timequiz.h b/src/timequiz.h
index 89d7376..9803ee9 100644
--- a/src/timequiz.h
+++ b/src/timequiz.h
@@ -5,5 +5,6 @@ void timequiz();
 int getRandomQuestionIndex(int askedQuestions[], int totalQuestions);
 void displayQuestion(char* question, char* answers[], int correctIndex);
 void processUserAnswer(int userAnswer, int correctIndex, int* score, int* totalCorrectAnswers, char* answers[]);
+int isValidAnswer(int userAnswer);
 
 #endif //ende TIMEQUIZ_H