diff --git a/education/software development/ECE1400/Chapter 15 Exercises.md b/education/software development/ECE1400/Chapter 15 Exercises.md
index 9b95c45..0d56933 100644
--- a/education/software development/ECE1400/Chapter 15 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 15 Exercises.md	
@@ -56,6 +56,11 @@ demo: main.o f1.o f2.o
 main.o: main.c f1.h
 	gcc -c main.c
 
+f1.o: f1.c f1.h
+	gcc -c f1.c
+
+f2.o 
+
 ```
 ---