diff --git a/README.md b/README.md
index 2cecc93..d1b76b2 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,9 @@
     - [Living Off The Land(LOL)](https://github.com/mether049/malware/blob/master/malware-tech_ref_and_memo.md#living-off-the-landlol)
     - [DGA](https://github.com/mether049/malware/blob/master/malware-tech_ref_and_memo.md#dga)
     - [Fast Flux](https://github.com/mether049/malware/blob/master/malware-tech_ref_and_memo.md#fast-flux)
+   - [Shell Backdoor](https://github.com/mether049/malware/blob/master/malware-tech_ref_and_memo.md#shell-backdoor)
+   - [rootkit(https://github.com/mether049/malware/blob/master/malware-tech_ref_and_memo.md#rootkit)
+    - [LKM rootkit](https://github.com/mether049/malware/blob/master/malware-tech_ref_and_memo.md#lkm-rootkit)
     
 - [Malware analysis method(reference&memo)](https://github.com/mether049/malware/blob/master/malware-analysis_ref_and_memo.md)
   - [Tools](https://github.com/mether049/malware/blob/master/malware-analysis_ref_and_memo.md#tools)