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diff --git a/doc/plugins/po.mdwn b/doc/plugins/po.mdwn
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@@ -150,6 +150,9 @@ the wiki homepage.
The `ISTRANSLATION` and `ISTRANSLATABLE` variables can be used to
display things only on translatable or translation pages.
+The `LANG_CODE` and `LANG_NAME` variables can respectively be used to
+display the current page's language code and pretty name.
+
### Display page's versions in other languages
The `OTHERLANGUAGES` loop provides ways to display other languages'