* theory.html: Give Asia/Calcutta as an example.

jkhendrik7 · Nov 20, 2019 · cc63659 · cc63659
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diff --git a/theory.html b/theory.html
@@ -298,6 +298,10 @@ <h2 id="naming">Timezone identifiers</h2>
     If a name is changed, put its old spelling in the
     '<code>backward</code>' file.
     This means old spellings will continue to work.
+    Ordinarily a name change should occur only in the rare case when
+    a location's consensus English-language spelling changes; for example,
+    in 2008 <code>Asia/Calcutta</code> was renamed to <code>Asia/Kolkata</code>
+    due to long-time widespread use of the new city name instead of the old.
   </li>
 </ul>