diff --git a/backup-nixos-configs.sh b/backup-nixos-configs.sh
new file mode 100644
index 0000000..bc92269
--- /dev/null
+++ b/backup-nixos-configs.sh
@@ -0,0 +1 @@
+cp /etc/nixos/* ./nixos/
diff --git a/init.vim b/init.vim
index 815e668..e42f3a8 100644
--- a/init.vim
+++ b/init.vim
@@ -35,6 +35,8 @@ Plug 'luochen1990/rainbow'
 
 " git
 Plug 'tpope/vim-fugitive'
+" gitlink
+Plug 'mazubieta/gitlink-vim'
 
 " go
 Plug 'fatih/vim-go' " Amazing combination of features.
@@ -227,6 +229,15 @@ syntax enable
 " viewer method:
 let g:vimtex_view_method = 'zathura'
 
+"" gitlink
+function! CopyGitLink(...) range
+  redir @+
+  silent echo gitlink#GitLink(get(a:, 1, 0))
+  redir END
+endfunction
+nmap <leader>gl :call CopyGitLink()<CR>
+vmap <leader>gl :call CopyGitLink(1)<CR>
+
 "" sage syntax
 augroup filetypedetect
   au! BufRead,BufNewFile *.sage,*.spyx,*.pyx setfiletype python
diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index 31eabea..0e82d8b 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -97,6 +97,8 @@
 	chromium
 	xfce.ristretto
 	pavucontrol
+	sage
+	obs-studio
   ];
 
   programs.zsh.enable = true;
@@ -136,4 +138,9 @@
   # bluetooth related
   hardware.bluetooth.enable = true;
   services.blueman.enable = true;
+
+  # obs virtual camera
+  boot.extraModulePackages = with config.boot.kernelPackages; [
+    v4l2loopback
+  ];
 }
diff --git a/nixos/surface-extra-hardware-configuration.nix b/nixos/surface-extra-hardware-configuration.nix
index 312572d..b877d12 100644
--- a/nixos/surface-extra-hardware-configuration.nix
+++ b/nixos/surface-extra-hardware-configuration.nix
@@ -29,4 +29,16 @@
 
   # add pulseaudio support to manage audio
   hardware.pulseaudio.enable = true;
+
+## NOTES:
+# Susspend issue:
+# https://github.com/linux-surface/linux-surface/wiki/Known-Issues-and-FAQ#suspend-aka-sleep-vs-lid-closingopening-events
+# run:
+# > sudo modprobe -r surface_gpe
+# and:
+# > sudo bash -c 'echo -e "\n# Blacklisting lid vs. suspend issue module\nblacklist surface_gpe" >> /etc/modprobe.d/blacklist.conf'
+#
+# Now folding the keyboard to the screen will not suspend and brick the
+# session, but you will need to manually suspend the session if saving battery
+# is desired.
 }