guix-packages/ambrevar/games: Document duke3d.grp install

.guix-packages/ambrevar/games.scm

@@ -1,6 +1,6 @@
 (define-module (ambrevar games)
-  #:use-module ((guix packages) #:select (package origin base32))
-  #:use-module ((guix download) #:select (url-fetch))
+  #:use-module (guix packages)
+  #:use-module (guix download)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (srfi srfi-1)
   #:use-module (guix utils)
@@ -208,6 +208,7 @@ babes you encounter wearing less stuff.")
                ;; - Need to expose GLU so that the polymer renderer can load.
                ;; - Make sure current directory is writable, else eduke32 will segfault.
                ;; - Add ../share/dukenukem3d to the dir search list.
+               ;; TODO: Skip store duke3d.grp When ~/.config/eduke32/duke3d.grp is found.
                (rename-file eduke eduke-real)
                (call-with-output-file eduke
                  (lambda (p)
@@ -246,7 +247,11 @@ Linux, Mac OS X, FreeBSD, several handhelds, your family toaster, and to your
 vibrator.  A thousands of cool and useful features and upgrades were added for
 regular players and additional editing capabilities and scripting extensions for
 homebrew developers and mod creators.  EDuke32 is open source but non-free
-software.")
+software.
+
+You'll need Duke Nukem 3D data files in order to play.  You can either install
+duke-nukem-3d-shareware or put whichever version of DUKE3D.GRP in
+~/.config/eduke32/.")
     (home-page "https://eduke32.com/")
     (license ((@@ (guix licenses) license) "BUILD license"
               "https://eduke32.com/buildlic.txt"