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diff --git a/CHANGELOG b/CHANGELOG
index 2758e62..5f32a57 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,8 @@
+= Unreleased
+
+* Fixed an unhandled exception when formatting a Tag that had been
+  decomposed.[bug=1857767]
+
 = 4.8.2 (20191224)
 
 * Added Python docstrings to all public methods of the most commonly