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diff --git a/xlib-tutorial/prog-1.cc b/xlib-tutorial/prog-1.cc
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+// Written by Ch. Tronche (http://tronche.lri.fr:8000/)
+// Copyright by the author. This is unmaintained, no-warranty free software. 
+// Please use freely. It is appreciated (but by no means mandatory) to
+// acknowledge the author's contribution. Thank you.
+// Started on Thu Jun 26 23:29:03 1997
+
+//
+// Xlib tutorial: 1st program
+// Make a window appear on the screen.
+//
+
+#include <X11/Xlib.h> // Every Xlib program must include this
+#include <assert.h>   // I include this to test return values the lazy way
+#include <unistd.h>   // So we got the profile for 10 seconds
+
+#define NIL (0)       // A name for the void pointer
+
+main()
+{
+      Display *dpy = XOpenDisplay(NIL);
+      assert(dpy);
+      Window w = XCreateWindow(dpy, DefaultRootWindow(dpy), 0, 0, 
+                               200, 100, 0, 
+                               CopyFromParent, CopyFromParent, CopyFromParent,
+                               NIL, 0);
+      XMapWindow(dpy, w);
+      XFlush(dpy);
+      sleep(10);
+}