diff --git a/CMU-CSAPP/labs/bomb_lab/dbomb.asm b/CMU-CSAPP/labs/bomb_lab/dbomb.asm
index 350b85d..3a8cbd6 100644
--- a/CMU-CSAPP/labs/bomb_lab/dbomb.asm
+++ b/CMU-CSAPP/labs/bomb_lab/dbomb.asm
@@ -650,30 +650,39 @@ Disassembly of section .text:
                                 # 0x603300 <node4>:       0x00000004000002b3      0x0000000000603310
                                 # 0x603310 <node5>:       0x00000005000001dd      0x0000000000603320
                                 # 0x603320 <node6>:       0x00000006000001bb      0x0000000000000000
+                                # this seems like a linked list
   4011a9:	eb cb                	jmp    401176 <phase_6+0x82>  # goto L6OuterLoop3Begin
 # L6OuterLoop3Exit
   4011ab:	48 8b 5c 24 20       	mov    0x20(%rsp),%rbx
   4011b0:	48 8d 44 24 28       	lea    0x28(%rsp),%rax
   4011b5:	48 8d 74 24 50       	lea    0x50(%rsp),%rsi
+# breakpoint 2
+# x/6xg ($rsp + 0x20) prints: 
+# 0x7fffffffd850: 0x00000000006032d0      0x00000000006032e0
+# 0x7fffffffd860: 0x00000000006032f0      0x0000000000603300
+# 0x7fffffffd870: 0x0000000000603310      0x0000000000603320
   4011ba:	48 89 d9             	mov    %rbx,%rcx
   4011bd:	48 8b 10             	mov    (%rax),%rdx
   4011c0:	48 89 51 08          	mov    %rdx,0x8(%rcx)
-  4011c4:	48 83 c0 08          	add    $0x8,%rax
+  4011c4:	48 83 c0 08          	add    $0x8,%rax  # rax seems like a pointer iterating through linked list
   4011c8:	48 39 f0             	cmp    %rsi,%rax
   4011cb:	74 05                	je     4011d2 <phase_6+0xde>
   4011cd:	48 89 d1             	mov    %rdx,%rcx
   4011d0:	eb eb                	jmp    4011bd <phase_6+0xc9>
   4011d2:	48 c7 42 08 00 00 00 	movq   $0x0,0x8(%rdx)
   4011d9:	00 
-  4011da:	bd 05 00 00 00       	mov    $0x5,%ebp
-  4011df:	48 8b 43 08          	mov    0x8(%rbx),%rax
-  4011e3:	8b 00                	mov    (%rax),%eax
+  4011da:	bd 05 00 00 00       	mov    $0x5,%ebp # ebp is set to 5
+#L6Loop4Start
+  4011df:	48 8b 43 08          	mov    0x8(%rbx),%rax # rax = rbx->next
+  4011e3:	8b 00                	mov    (%rax),%eax  # eax = rax->value_low32bit
   4011e5:	39 03                	cmp    %eax,(%rbx)
-  4011e7:	7d 05                	jge    4011ee <phase_6+0xfa>
+  4011e7:	7d 05                	jge    4011ee <phase_6+0xfa>  # if next value >= current value, pass the test.
+                                                              # This means the linked list should be in descending order.
   4011e9:	e8 4c 02 00 00       	call   40143a <explode_bomb>
   4011ee:	48 8b 5b 08          	mov    0x8(%rbx),%rbx
-  4011f2:	83 ed 01             	sub    $0x1,%ebp
+  4011f2:	83 ed 01             	sub    $0x1,%ebp # ebp is the counter. 6 loops
   4011f5:	75 e8                	jne    4011df <phase_6+0xeb>
+#L6Loop4End
   4011f7:	48 83 c4 50          	add    $0x50,%rsp
   4011fb:	5b                   	pop    %rbx
   4011fc:	5d                   	pop    %rbp
diff --git a/CMU-CSAPP/labs/bomb_lab/pswd.txt b/CMU-CSAPP/labs/bomb_lab/pswd.txt
index 3ff0a0c..8c1d899 100644
--- a/CMU-CSAPP/labs/bomb_lab/pswd.txt
+++ b/CMU-CSAPP/labs/bomb_lab/pswd.txt
@@ -3,3 +3,4 @@ Border relations with Canada have never been better.
 0 207
 7 0
 )/.%&'
+4 3 2 1 6 5