diff --git a/roles/emacs.nix b/roles/emacs.nix
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+/*
+This is a nix expression to build Emacs and some Emacs packages I like
+from source on any distribution where Nix is installed. This will install
+all the dependencies from the nixpkgs repository and build the binary files
+without interfering with the host distribution.
+
+To build the project, type the following from the current directory:
+
+$ nix-build emacs.nix
+
+To run the newly compiled executable:
+
+$ ./result/bin/emacs
+*/
+{ pkgs ? import <nixpkgs> {} }: 
+
+let
+  myEmacs = pkgs.emacs; 
+  emacsWithPackages = (pkgs.emacsPackagesNgGen myEmacs).emacsWithPackages; 
+in
+  emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [ 
+    magit          # ; Integrate git <C-x g>
+    zerodark-theme # ; Nicolas' theme
+  ]) ++ (with epkgs.melpaPackages; [ 
+    #undo-tree      # ; <C-x u> to show the undo tree
+    #zoom-frm       # ; increase/decrease font size for all buffers %lt;C-x C-+>
+  ]) ++ (with epkgs.elpaPackages; [ 
+    auctex         # ; LaTeX mode
+    beacon         # ; highlight my cursor when scrolling
+    nameless       # ; hide current package name everywhere in elisp code
+  ]) ++ [
+    pkgs.notmuch   # From main packages set 
+  ])