diff --git a/doc/dio.sgml b/doc/dio.sgml
index c85992a4a..39aac251c 100644
--- a/doc/dio.sgml
+++ b/doc/dio.sgml
@@ -25,8 +25,7 @@ released with the <tt>dio_close</tt> function.
     dhandle_t __fastcall__ dio_open (unsigned char device);
 </verb></tscreen>
 
-The <tt>device</tt> specifies the device to access, with 0 being the first
-device, 1 the second, and so on.
+The <tt>device</tt> specifies the device to access.
 
 <tscreen><verb>
     unsigned char __fastcall__ dio_close (dhandle_t handle);