note about IDNs for isso

Kwpolska · Kwpolska · commit b42bde4b4184 · 2015-04-24T19:20:56.000+02:00
Signed-off-by: Chris Warrick &lt;kwpolska@gmail.com&gt;
diff --git a/docs/manual.txt b/docs/manual.txt
@@ -1182,7 +1182,8 @@ to one of "disqus", "intensedebate", "livefyre", "moot", "googleplus",
    * For Facebook, you need to `create an app
      <https://developers.facebook.com/apps>` (turn off sandbox mode!)
      and get an **App ID**
-   * For isso, it is the URL of isso (must be world-accessible and **have a trailing slash**,
+   * For isso, it is the URL of isso (must be world-accessible, encoded with
+     Punycode (if using Internationalized Domain Names) and **have a trailing slash**,
      default ``http://localhost:8080/``)
 
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