diff --git a/PwnCollege/KernelExploitation/Level1/exploit.c b/PwnCollege/KernelExploitation/Level1/exploit.c
index 7634ee3..46bc506 100644
--- a/PwnCollege/KernelExploitation/Level1/exploit.c
+++ b/PwnCollege/KernelExploitation/Level1/exploit.c
@@ -26,9 +26,17 @@ int main() {
     printf("%s", &buf[0x200]);
     return 0;
 }
-// $ sudo cat /proc/modules
+
+// Protection:
+// - No KASLR. 
+// - CONFIG_SLAB_FREELIST_RANDOM=n
+// - CONFIG_SLAB_FREELIST_HARDENED=n
+
+// Debug:
+// Use `sudo cat /proc/modules` to get kernel module base.
 // gdb> add-symbol-file /challenge/challenge1.ko 0xffffffffc0000000
 // gdb> b kheap_open
 // gdb> b kheap_ioctl
-// A slot is 0x200 bytes.
+// An aligned slub slot is 0x200 bytes.
+
 // $ gcc exploit.c -o exploit
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