diff --git a/README.md b/README.md
index 2c59858..0322a27 100644
--- a/README.md
+++ b/README.md
@@ -67,17 +67,17 @@ or in BibTeX
   - [Steganography](/Basic_Computer_Skills_for_Forensics/10_Steganography.pptx)
   - [Forensic Report Template](/Basic_Computer_Skills_for_Forensics/Forensic_Report_Template.pdf)
 - Computer Forensics Case Study
-  - [Investigating NIST Data Leakage (Windows XP)](#Investigating-NIST-Data-Leakage)
-  - [Investigating P2P Data Leakage (Windows 10)](#Investigating-P2P-Data-Leakage)
-  - [Investigating Illegal Possession of Images ("Networking forensics")](#Investigating-Illegal-Possession-of-Images)
-  - [Investigating Email Harassment](#Investigating-Email-Harassment) (updated on Feb 2023)
-  - [Investigating Illegal File Transferring (Memory Forensics)](#Investigating-illegal-File-Transferring)
-  - [Investigating Hacking Case](#Investigating-Hacking-Case)
-  - [Investigating Morris Worm Attack](#Investigating-Morris-Worm-Attack) (updated on Jan 2023, [POSTER](/papers/poster_Morris_Worm_Attack.pdf))
+  - [Investigating NIST Data Leakage (Windows XP)](#investigating-nist-data-leakage)
+  - [Investigating P2P Data Leakage (Windows 10)](#investigating-p2p-data-leakage)
+  - [Investigating Illegal Possession of Images ("Networking forensics")](#investigating-illegal-possession-of-images)
+  - [Investigating Email Harassment](#investigating-email-harassment) (updated on Feb 2023)
+  - [Investigating Illegal File Transferring (Memory Forensics)](#investigating-illegal-file-transferring)
+  - [Investigating Hacking Case](#investigating-hacking-case)
+  - [Investigating Morris Worm Attack](#investigating-morris-worm-attack) (updated on Jan 2023, [POSTER](/papers/poster_Morris_Worm_Attack.pdf))
 - Mobile/IoT Forensics Case Study
-  - [Investigating Android 10](#Investigating-Android-10) (added on 10/24/2021)
-  - [Investigating iPhone iOS 13](#Investigating-iPhone-iOS-13) (updated on 6/18/2022)
-  - [Investigating Drone](#Investigating-Drone-DJI) (add on 12/07/2021)
+  - [Investigating Android 10](#investigating-android-10) (added on 10/24/2021)
+  - [Investigating iPhone iOS 13](#investigating-iphone-ios-13) (updated on 6/18/2022)
+  - [Investigating Drone](#investigating-drone-dji) (add on 12/07/2021)
 - Forensic Intelligence Repository
   - [Email forensics](/STIX_for_digital_forensics/Email_Harassment)
   - [Illegal Possession of Images](/STIX_for_digital_forensics/Illegal_Possession_Images)