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diff --git a/HISTORY.md b/HISTORY.md
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+++ b/HISTORY.md
@@ -6,6 +6,11 @@
 
 - Dropped Python 2 support
 
+### Improvements
+
+- Formats can now be dynamically registered through the
+  `tablib.formats.registry.refister` API (#256).
+
 ### Bugfixes
 
 - Fixed a crash when exporting an empty string with the ReST format (#368)