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diff --git a/TODO.md b/TODO.md
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@@ -10,6 +10,7 @@
 * [ ] Fields:
   * [ ] Convert some `note` fields to `urldate`.
   * [ ] Language field using ISO codes. Is there a standard field already?
+  * [ ] License field.
 * [ ] Cataloguing:
   * [ ] Improve sorting and categorization in files.
   * [ ] Populate BibTeX custom tag and langued fields.