diff --git a/poster_template/main.tex b/poster_template/main.tex
index d6190fa..6c549f6 100644
--- a/poster_template/main.tex
+++ b/poster_template/main.tex
@@ -1,24 +1,19 @@
-\DocumentMetadata{
-  pdfversion=2.0,
-  pdfstandard=ua-2,
-  lang=en-US,
-}
+% ACCESSIBILITY: this poster is not a tagged PDF. The beamer class
+% rejects \DocumentMetadata outright ("Class beamer Error: The beamer
+% class is not compatible with \DocumentMetadata"), and the LaTeX
+% Tagging Project lists both beamer and beamerposter as no-support,
+% meaning incompatible and not expected to change. beamerposter also
+% pulls in textpos and subfig, which are incompatible in their own
+% right.
+%
+% There is no way to make this template produce an accessible PDF
+% today. Rather than declare PDF/UA-2 and ship an untagged file, it
+% makes no claim at all. If a poster has to be accessible, supply a
+% tagged companion document built from the paper or memo template.
 \documentclass[xcolor=dvipsnames, 12pt]{beamer}
 
 \usepackage[size=custom, width=114, height=80, scale=1.5]{beamerposter}
 
-\usepackage{tagpdf}
-\tagpdfsetup{activate-all}
-
-% Tag frame titles as H1 headings for PDF accessibility
-\addtobeamertemplate{frametitle}{%
-  \tagstructbegin{tag=H1}%
-  \tagmcbegin{tag=H1}%
-}{%
-  \tagmcend%
-  \tagstructend%
-}
-
 \usepackage[absolute,overlay]{textpos}
 % set up the file to create notes in the output PDFs