diff --git a/README.md b/README.md
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 # An archive of Psion Software (EPOC32 mainly) that I come across
 
 ##Contents
-* RS232 OPM
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+* RS232 OPM
+
+##Links
+ * [OPX on S5](http://www.users.globalnet.co.uk/~datajam/opl-manual/html/opl/opchapt13.html)
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