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diff --git a/CHANGELOG b/CHANGELOG
index 450e8d1..921f639 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -3,6 +3,9 @@
 * Fixed a deprecation warning on Python 3.7. Patch by Colin
   Watson. [bug=1847592]
 
+* The html.parser tree builder now correctly handles DOCTYPEs that are
+  not uppercase. [bug=1848401]
+
 * Added a Chinese translation by Deron Wang and a Brazilian Portuguese
   translation by Cezar Peixeiro to the repository.