work on docs

docs/tacs.html

@@ -31,7 +31,7 @@ Total Access Communication System (TACS) and ETACS are mostly-obsolete variants
 </ul>
 
 <p>
-TACS is the UK version of the AMPS.
+(J)TACS is the UK and Japanese version of the AMPS.
 There are three major differences:
 </p>
 
@@ -42,7 +42,7 @@ There are three major differences:
 </ul>
 
 <p>
-Refer to <a href="amps.html">AMPS</a> documentation, but use executable 'tacs' instead of 'amps'.
+Refer to <a href="amps.html">AMPS</a> documentation, but use executable 'tacs' or 'jtacs' instead of 'amps'.
 </p>
 
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