add a reference to the repo for the special version of SDCC with cc1111 sdcdb

diff --git a/AltOS/index.mdwn b/AltOS/index.mdwn
index f772dd488f7092a91811f0b91a07b50071668060..90c1c9a3ea50ba14aef054b3fe1af6a5ade47bd9 100644 (file)
--- a/AltOS/index.mdwn
+++ b/AltOS/index.mdwn
@@ -21,6 +21,12 @@ The firmware and associated software are licensed [GPL version 2](http://www.gnu
 The latest source is always available from [git.gag.com](http://git.gag.com) 
 in the project [fw/altos](http://git.gag.com/?p=fw/altos;a=summary).  
 
+If you need to debug code on an Altus Metrum product, you may want the special
+version of SDCC containing a highly modified sdcdb with support for the cc1111
+debugging interface, which you can find on [git.gag.com](http://git.gag.com) 
+in the project [fw/sdcc](http://git.gag.com/?p=fw/sdcc;a=summary).  This is
+not necessary if you just want to rebuild AltOS and use it.
+
 ## Features ##
 
 Version 0.7.1 is the first release containing our new cross-platform Java-based user interface. AltosUI can: