diff --git a/README.md b/README.md
index 64ddf02..e05fb99 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # Debug and diagnostics cheat sheets
 
 
+## Network and Security vendors
+
 [Fortigate debug and diagnose commands complete cheat sheet](Fortigate-debug-diagnose-complete-cheat-sheet.adoc) | [PDF](Fortigate-debug-diagnose-complete-cheat-sheet.pdf)
 
 [Cisco Nexus 9000 9k debug and diagnostic commands cheat sheet](Cisco-Nexus-9000-9k-debug-and-diagnostic-commands-cheat-sheet.adoc) | [PDF](Cisco-Nexus-9000-9k-debug-and-diagnostic-commands-cheat-sheet.pdf)
@@ -10,6 +12,8 @@
 [MRV Optiswitch OS904 OS906 OS912 debug and diagnostic commands](MRV-Optiswitch-OS904-OS906-OS912-debug-and-diagnostic-commands.adoc) | [PDF](MRV-Optiswitch-OS904-OS906-OS912-debug-and-diagnostic-commands.pdf)
 
 
+## Linux, FreeBSD, OpenBSD, and Open Source Tools
+
 [Linux and PF BSD firewalls cheat sheet](Linux-and-BSD-firewalls-cheat-sheet.adoc) | [PDF](Linux-and-BSD-firewalls-cheat-sheet.pdf)