diff --git a/2013/08_adding/add.cpp b/2013/08_adding/add.cpp
index 20ebe4f9..26f13c49 100644
--- a/2013/08_adding/add.cpp
+++ b/2013/08_adding/add.cpp
@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include <stdlib.h>
+#include <stdlib.h>// header files//
 
 int main(int argc, char *argv[]){
 
diff --git a/2013/a03_arrays/fibonacci.cpp b/2013/a03_arrays/fibonacci.cpp
index a4c9dc24..cb4b4693 100644
--- a/2013/a03_arrays/fibonacci.cpp
+++ b/2013/a03_arrays/fibonacci.cpp
@@ -9,11 +9,11 @@ int main(int argc, char *argv[]){
 
     f[1] = f[0] = 1;
     
-    for(int i=2; i<N; i++)
+    for(int i=2; i<N; i++)// for loop//
 	f[i] = f[i-1] + f[i-2];
 
-    for(int i=0; i<N; i++)
-	printf("%i ", f[i]);
+    for(int i=0; i<N; i++)// for loop//
+	printf("%i ", f[i]);// print the series//
     printf("\n");
 
     return EXIT_SUCCESS;