diff --git a/CHANGES b/CHANGES
index 6602511..ac5e240 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,7 +1,10 @@
 
 0.14.3 August ??, 2026
 
+- The `aside` element is now allowed. becomes div[class=aside] in epub2.
+
 - In both in HTML and EPUB, for improved accessibility, added the css rule `a[href] {text-decoration: underline;}` to make sure links are underlined. Previously, we underlined all `a` elements, which ignored prior usage as an link target.
+
 - handling of inline SVG has been improved.
     - the inline SVG element is now handled whether or not it has set the svg namespace.
     - inline SVG is changed to standalone files in EPUB2
diff --git a/src/ebookmaker/writers/EpubWriter.py b/src/ebookmaker/writers/EpubWriter.py
index c2f62ff..89c4afb 100644
--- a/src/ebookmaker/writers/EpubWriter.py
+++ b/src/ebookmaker/writers/EpubWriter.py
@@ -1081,7 +1081,8 @@ def fix_html5(xhtml):
 
         # replace html5 block tags
         usedtags = set()
-        for newtag in ['article', 'figcaption', 'figure', 'footer', 'header', 'section', 'nav', 'main']:
+        for newtag in ['article', 'figcaption', 'figure', 'footer', 'header', 'section', 'nav',
+                       'main', 'aside']:
             for tag in xpath(xhtml, f'//xhtml:{newtag}'):
                 usedtags.add(newtag)
                 tag.tag = NS.xhtml.div