Description of what's here
diff --git a/Demo/sgi/README b/Demo/sgi/README
new file mode 100644
index 0000000..3ef80d2
--- /dev/null
+++ b/Demo/sgi/README
@@ -0,0 +1,22 @@
+Demonstrations of Python that use various features of the Silicon
+Graphics IRIS machines.
+
+al Demonstrations of the audio capabilities of the
+ Indigo. Require the built-in module 'al'. One program
+ also needs the build-in module 'fl' (the FORMS
+ library by Mark Overmars.)
+
+cd Demonstrations of the CD-ROM player's audio interface,
+ built-in module 'cd'.
+
+flp Demonstrations of using the 'flp' standard module,
+ which enables you to quickly create forms using the
+ 'fl' built-in module (available if you use the FORMS
+ library by Mark Overmars).
+
+gl Demonstrations of the Graphics Library (GL).
+ Require the built-in module 'gl'.
+
+sv Demonstrations of the Indigo Video module.
+ Requires the built-in module 'sv'. See also the
+ following directory.