Fix issue #23, Clarify st_other.

Signed-off-by: Bill Schmidt <wschmidt@linux.vnet.ibm.com>

specification/ch_3.xml

@@ -309,7 +309,8 @@ e_ident[EI_DATA]     ELFDATA2LSB  For all little-endian implementations.</progra
       function. The local entry point is used when r2 is known to already be
       valid for the function. A value of zero in these bits asserts that the
       function does not use r2.</para>
-      <para>The st_other values have the following meanings:</para>
+      <para>The values of these three most significant bits of the st_other
+      field have the following meanings:</para>
       <informaltable frame="none" colsep="0" rowsep="0">
         <tgroup cols="2">
           <colspec colname="c1" colwidth="10*" />